Develop Reference

.NET Delete in ListView isn't passing any values

For some reason, all my ListView functions work, except my delete button. I have debugged, and it points to the right method for deletion, but it's just passing all null values. I have no idea what the issue is, everything else seems to be working just fine. here is my listview code:
<asp:ListView ID="EntReqListView" runat="server" InsertItemPosition="LastItem" DataSourceID="EntranceReqODS" Visible="false">
<AlternatingItemTemplate>
<tr style="">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="ProgramIDLabel" runat="server" Text='<%# Bind("ProgramID") %>' />
</td>
<td>
<asp:Label ID="CourseIDLabel" runat="server" Text='<%# Bind("CourseID") %>' />
</td>
<td>
<asp:Label ID="CourseNameLabel" runat="server" Text='<%# Bind("CourseName") %>' />
</td>
<td>
<asp:Label ID="MarkLabel" runat="server" Text='<%# Bind("Mark") %>' />
</td>
</tr>
</AlternatingItemTemplate>
<EditItemTemplate>
<tr style="">
<td>
<asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
</td>
<td>
<asp:Label ID="ProgramIDTextBox" runat="server" Text='<%# Bind("ProgramID") %>' />
</td>
<td>
<asp:Label ID="CourseIDTextBox" runat="server" Text='<%# Bind("CourseID") %>' />
</td>
<td>
<asp:Label ID="CourseNameTextBox" runat="server" Text='<%# Bind("CourseName") %>' />
</td>
<td>
<asp:TextBox ID="MarkTextBox" runat="server" Text='<%# Bind("Mark") %>' />
</td>
</tr>
</EditItemTemplate>
<EmptyDataTemplate>
<table runat="server" style="">
<tr>
<td>No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert"/>
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
</td>
<td>
<asp:TextBox ID="ProgramIDTextBox" runat="server" value="<%# ProgramID.Text %>" Text='<%# Bind("ProgramID")%>' onkeydown="javascript:return false"/>
</td>
<td>
<asp:Label ID="CourseIDTextBox" runat="server" Text='<%# Bind("CourseID") %>' />
</td>
<td>
<asp:DropDownList ID="EntReqCourses" runat="server"
DataSourceID="CourseListODS"
DataTextField="SubjectName"
DataValueField="CourseID"
SelectedValue='<%# Bind("CourseID") %>' AppendDataBoundItems="True">
<asp:ListItem Text="--Select One--" Value="" />
</asp:DropDownList>
</td>
<td>
<asp:TextBox ID="MarkTextBox" runat="server" Text='<%# Bind("Mark") %>' />
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr style="">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="ProgramIDLabel" runat="server" Text='<%# Bind("ProgramID") %>' />
</td>
<td>
<asp:Label ID="CourseIDLabel" runat="server" Text='<%# Bind("CourseID") %>' />
</td>
<td>
<asp:Label ID="CourseNameLabel" runat="server" Text='<%# Bind("CourseName") %>' />
</td>
<td>
<asp:Label ID="MarkLabel" runat="server" Text='<%# Bind("Mark") %>' />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table id="itemPlaceholderContainer" runat="server" border="0" style="">
<tr runat="server" style="">
<th runat="server"></th>
<th runat="server">ProgramID</th>
<th runat="server">CourseID</th>
<th runat="server">CourseName</th>
<th runat="server">Mark</th>
</tr>
<tr id="itemPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server" style="">
<asp:DataPager ID="DataPager1" runat="server">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowLastPageButton="True" />
</Fields>
</asp:DataPager>
</td>
</tr>
</table>
</LayoutTemplate>
<SelectedItemTemplate>
<tr style="">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="ProgramIDLabel" runat="server" Text='<%# Bind("ProgramID") %>' />
</td>
<td>
<asp:Label ID="CourseIDLabel" runat="server" Text='<%# Bind("CourseID") %>' />
</td>
<td>
<asp:Label ID="CourseNameLabel" runat="server" Text='<%# Bind("CourseName") %>' />
</td>
<td>
<asp:Label ID="MarkLabel" runat="server" Text='<%# Bind("Mark") %>' />
</td>
</tr>
</SelectedItemTemplate>
</asp:ListView>
I set up all my CRUD methods through the wizard, here is the delete method it goes to:
[DataObjectMethod(DataObjectMethodType.Delete, false)]
public void EntReq_Delete(EntranceRequirementInfo item)
{
using (Pathway_Model context = new Pathway_Model())
{
EntranceRequirement existing = context.EntranceRequirements.Find(item.CourseID, item.ProgramID);
context.EntranceRequirements.Remove(existing);
context.SaveChanges();
}
}
My ODS:
<asp:ObjectDataSource ID="EntranceReqODS" runat="server" DataObjectTypeName="Pathway_System.Entities.DTOs.EntranceRequirementInfo" DeleteMethod="EntReq_Delete" InsertMethod="EntReq_Add" OldValuesParameterFormatString="original_{0}" SelectMethod="EntReqList_byID" TypeName="Pathway_System.BLL.PathwaysController" UpdateMethod="EntReq_Update">
<SelectParameters>
<asp:ControlParameter ControlID="CertificateList" Name="programID" PropertyName="SelectedValue" Type="Int32" DefaultValue="" />
</SelectParameters>
</asp:ObjectDataSource>

ListView CheckBox issue

I'm having a ListView in grid format which comprises headers as (NAME,ID,ADDRESS,GENDER,MOBILENO,PHOTO,BLOCK).
The BLOCK column consists a CheckBox in each row.
When the checkbox is checked in the BLOCK column,
that particular row of the checkbox should be changed to ReadOnly,
resulting in change of that particular row's backcolor.
my listview coding in aspx is...
<AlternatingItemTemplate>
<tr class="AITtr">
<td>
<asp:Label ID="NAMELabel" runat="server" Text='<%# Eval("NAME") %>' />
</td>
<td>
<asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' />
</td>
<td>
<asp:Label ID="ADDRESSLabel" runat="server" Text='<%# Eval("ADDRESS") %>' />
</td>
<td>
<asp:Label ID="GENDERLabel" runat="server" Text='<%# Eval("GENDER") %>' />
</td>
<td>
<asp:Label ID="MOBILENOLabel" runat="server" Text='<%# Eval("MOBILENO") %>' />
</td>
<td>
<asp:Image ID="Image1" runat="server" ImageUrl='<%#Eval("PHOTO") %>' Height="30" Width="30" />
</td>
<td>
<asp:CheckBox ID="BLOCKCheckBox" runat="server" Checked="false" Enabled="true" />
</td>
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light"/>
</td>
</tr>
</AlternatingItemTemplate>
<EditItemTemplate>
<tr class="EITtr">
<td>
<asp:TextBox ID="NAMETextBox" runat="server" Text='<%# Bind("NAME") %>' />
</td>
<td>
<asp:Label ID="IDLabel1" runat="server" Text='<%# Eval("ID") %>' />
</td>
<td>
<asp:TextBox ID="ADDRESSTextBox" runat="server" Text='<%# Bind("ADDRESS") %>' />
</td>
<td>
<asp:TextBox ID="GENDERTextBox" runat="server" Text='<%# Bind("GENDER") %>' />
</td>
<td>
<asp:TextBox ID="MOBILENOTextBox" runat="server" Text='<%# Bind("MOBILENO") %>' />
</td>
<td>
<asp:TextBox ID="PHOTOTextBox" runat="server" Text='<%# Bind("PHOTO") %>' />
</td>
<td>
<asp:CheckBox ID="BLOCKCheckBox" runat="server" Checked="false" Enabled="true" />
</td>
<td>
<asp:Button ID="UpdateButton" runat="server" CommandName="Update"
Text="Update" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Cancel" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
</td>
</tr>
</EditItemTemplate>
<EmptyDataTemplate>
<table runat="server" class="EDTtable" >
<tr>
<td>
No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<InsertItemTemplate>
<tr>
<td>
<asp:TextBox ID="NAMETextBox" runat="server" Text='<%# Bind("NAME") %>' />
</td>
<td>
</td>
<td>
<asp:TextBox ID="ADDRESSTextBox" runat="server" Text='<%# Bind("ADDRESS") %>' />
</td>
<td>
<asp:TextBox ID="GENDERTextBox" runat="server" Text='<%# Bind("GENDER") %>' />
</td>
<td>
<asp:TextBox ID="MOBILENOTextBox" runat="server" Text='<%# Bind("MOBILENO") %>' />
</td>
<td>
<asp:TextBox ID="PHOTOTextBox" runat="server" Text='<%# Bind("PHOTO") %>' />
</td>
<td>
<asp:CheckBox ID="BLOCKCheckBox" runat="server" Checked="false" Enabled="true" />
</td>
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert"
Text="Insert" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light"/>
<asp:Button ID="CancelButton1" runat="server" CommandName="Cancel"
Text="Clear" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr class="ITtr">
<td>
<asp:Label ID="NAMELabel" runat="server" Text='<%# Eval("NAME") %>' />
</td>
<td>
<asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' />
</td>
<td>
<asp:Label ID="ADDRESSLabel" runat="server" Text='<%# Eval("ADDRESS") %>' />
</td>
<td>
<asp:Label ID="GENDERLabel" runat="server" Text='<%# Eval("GENDER") %>' />
</td>
<td>
<asp:Label ID="MOBILENOLabel" runat="server" Text='<%# Eval("MOBILENO") %>' />
</td>
<td>
<asp:Image ID="Image" runat="server" ImageUrl='<%#Eval("PHOTO") %>' Height="30" Width="30" />
</td>
<td>
<asp:CheckBox ID="BLOCKCheckBox" runat="server" Checked="false" Enabled="true" />
</td>
<td>
<asp:Button ID="DeleteButton1" runat="server" CommandName="Delete"
Text="Delete" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
<asp:Button ID="EditButton1" runat="server" CommandName="Edit" Text="Edit" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light"/>
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table ID="itemPlaceholderContainer" runat="server" border="1" class="LTtable" >
<tr runat="server" Class="LTtr">
<th runat="server">
NAME</th>
<th runat="server">
ID</th>
<th runat="server">
ADDRESS</th>
<th runat="server">
GENDER</th>
<th runat="server">
MOBILENO</th>
<th runat="server">
PHOTO</th>
<th runat="server">
BLOCK</th>
<th id="Th1" runat="server">
</th>
</tr>
<tr ID="itemPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server" class="LTtd">
</td>
</tr>
</table>
</LayoutTemplate>
<SelectedItemTemplate>
<tr Class=".SITtr">
<td>
<asp:Label ID="NAMELabel" runat="server" Text='<%# Eval("NAME") %>' />
</td>
<td>
<asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>' />
</td>
<td>
<asp:Label ID="ADDRESSLabel" runat="server" Text='<%# Eval("ADDRESS") %>' />
</td>
<td>
<asp:Label ID="GENDERLabel" runat="server" Text='<%# Eval("GENDER") %>' />
</td>
<td>
<asp:Label ID="MOBILENOLabel" runat="server" Text='<%# Eval("MOBILENO") %>' />
</td>
<td>
<asp:Label ID="PHOTOLabel" runat="server" Text='<%# Eval("PHOTO") %>' />
</td>
<td>
<asp:CheckBox ID="BLOCKCheckBox" runat="server" Checked="false" Enabled="true" />
</td>
<td>
<asp:Button ID="DeleteButton2" runat="server" CommandName="Delete"
Text="Delete" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light" />
<asp:Button ID="EditButton2" runat="server" CommandName="Edit" Text="Edit" BackColor="#577109" ForeColor="Black" BorderStyle="Solid" Font-Names="Copperplate Gothic Light"/>
</td>
</tr>
</SelectedItemTemplate>
</asp:ListView>
my aspx.cs coding is....
protected void ListView1_OnItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
CheckBox BLOCKCheckBox = (e.Item.FindControl("BLOCKCheckBox") as CheckBox);
if (BLOCKCheckBox.Checked)
{
}
else
{
}
}
}
Kindly help me.....
Thanks....

add oncheckedChanged for block check box and autopostback=true
aspx.cs
protected void BLOCKCheckBox_CheckedChanged(object sender, EventArgs e)
{
CheckBox checkbox = (CheckBox)sender;
ListViewItem itm = (ListViewItem)checkbox.NamingContainer;
if (lstview1.EditIndex == itm.DisplayIndex)
{
(itm.FindControl("NAMETextBox") as TextBox).ReadOnly = true;
}
}

ASP.net listview dropdown item getting the value from another table

I am trying to build an admin page in order to let the user create edit update the records of the specific table. "District" table has the following properties: DistrictID, DistrictName, Description, DistrictImage, CityFK. Since CityFK is just numbers which represents CityID of the table "City" and does not mean anything to the user I have used a dropdown menu instead and it displays all city names as "DataTextField" and CityIDs as "DataValueField" from the table "City". But my aim is to insert that "DataValueField" into the District table as CityFK. But whenever I enter a new District record and choose a City from the dropdown and press "Insert" button of the listview, CityFK of that regarding record is "0".
I paste the whole listview but if you look at the dropdownlist at the InsertItemTemplate or EditItemTemplate you will what I mean;
<asp:ListView ID="DistrictList" runat="server" DataKeyNames="DistrictID" InsertItemPosition="LastItem" DataSourceID="DistrictEntityDataSource" >
<AlternatingItemTemplate>
<tr style="background-color:#FFF8DC;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="DistrictIDLabel" runat="server" Text='<%# Eval("DistrictID") %>' />
</td>
<td>
<asp:Label ID="DistrictNameLabel" runat="server" Text='<%# Eval("DistrictName") %>' />
</td>
<td>
<asp:Label ID="DescriptionLabel" runat="server" Text='<%# Eval("Description") %>' />
</td>
<td>
<asp:Image ID="DistrictImageLabel" runat="server" Height="100px" ImageUrl='<%# "~/Handlers/ImageHandler.ashx?ID="+Eval("DistrictID")+"&Entity=District"%>'/>
</td>
<td>
<asp:Label ID="CityFKLabel" runat="server" Text='<%# Eval("CityFK") %>' />
</td>
</tr>
</AlternatingItemTemplate>
<EditItemTemplate>
<tr style="background-color:#008A8C;color: #FFFFFF;">
<td>
<asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
</td>
<td>
<asp:Label ID="DistrictIDLabel1" runat="server" Text='<%# Eval("DistrictID") %>' />
</td>
<td>
<asp:TextBox ID="DistrictNameTextBox" runat="server" Text='<%# Bind("DistrictName") %>' />
</td>
<td>
<asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>' />
</td>
<td>
<asp:FileUpload ID="FileUploadDistrict2" runat="server" />
</td>
<td>
<asp:DropDownList ID="CityFKDropDownList" runat="server" AutoPostBack="true" DataSourceID="ddlCityFK_DataSource" ViewStateMode="Enabled"
DataTextField="CityName" DataValueField="CityID"
AppendDataBoundItems="true">
<asp:ListItem Text="-Stadt Wählen-" Value="0" ></asp:ListItem>
</asp:DropDownList>
<asp:EntityDataSource ID="ddlCityFK_DataSource" runat="server"
ConnectionString="name=MedicalEntities" DefaultContainerName="MedicalEntities"
EntitySetName="Cities" >
</asp:EntityDataSource>
</td>
</tr>
</EditItemTemplate>
<EmptyDataTemplate>
<table runat="server" style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;">
<tr>
<td>No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
</td>
<td>
<asp:TextBox ID="DistrictIDTextBox" runat="server" Text='<%# Bind("DistrictID") %>' />
</td>
<td>
<asp:TextBox ID="DistrictNameTextBox" runat="server" Text='<%# Bind("DistrictName") %>' />
</td>
<td>
<asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>' />
</td>
<td>
<asp:FileUpload ID="FileUploadDistrict" runat="server"/>
</td>
<td>
<asp:DropDownList ID="CityFKDropDownList" runat="server" AutoPostBack="true" DataSourceID="ddlCityFK_DataSource" ViewStateMode="Enabled"
DataTextField="CityName" DataValueField="CityID"
AppendDataBoundItems="true">
<asp:ListItem Text="-Stadt Wählen-" Value="0" ></asp:ListItem>
</asp:DropDownList>
<asp:EntityDataSource ID="ddlCityFK_DataSource" runat="server"
ConnectionString="name=MedicalEntities" DefaultContainerName="MedicalEntities"
EntitySetName="Cities">
</asp:EntityDataSource>
</td>
</tr>
</InsertItemTemplate>
<ItemTemplate>
<tr style="background-color:#DCDCDC;color: #000000;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="DistrictIDLabel" runat="server" Text='<%# Eval("DistrictID") %>' />
</td>
<td>
<asp:Label ID="DistrictNameLabel" runat="server" Text='<%# Eval("DistrictName") %>' />
</td>
<td>
<asp:Label ID="DescriptionLabel" runat="server" Text='<%# Eval("Description") %>' />
</td>
<td>
<asp:Image ID="DistrictImageLabel" runat="server" Height="100px" ImageUrl='<%# "~/Handlers/ImageHandler.ashx?ID="+Eval("DistrictID")+"&Entity=District"%>'/>
</td>
<td>
<asp:Label ID="CityFKLabel" runat="server" Text='<%# Eval("CityFK") %>' />
</td>
</tr>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table id="itemPlaceholderContainer" runat="server" border="1" style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;font-family: Verdana, Arial, Helvetica, sans-serif;">
<tr runat="server" style="background-color:#DCDCDC;color: #000000;">
<th runat="server"></th>
<th runat="server">DistrictID</th>
<th runat="server">DistrictName</th>
<th runat="server">Description</th>
<th runat="server">DistrictImage</th>
<th runat="server">CityFK</th>
</tr>
<tr id="itemPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server" style="text-align: center;background-color: #CCCCCC;font-family: Verdana, Arial, Helvetica, sans-serif;color: #000000;">
<asp:DataPager ID="DataPager1" runat="server">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowLastPageButton="True" />
</Fields>
</asp:DataPager>
</td>
</tr>
</table>
</LayoutTemplate>
<SelectedItemTemplate>
<tr style="background-color:#008A8C;font-weight: bold;color: #FFFFFF;">
<td>
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
</td>
<td>
<asp:Label ID="DistrictIDLabel" runat="server" Text='<%# Eval("DistrictID") %>' />
</td>
<td>
<asp:Label ID="DistrictNameLabel" runat="server" Text='<%# Eval("DistrictName") %>' />
</td>
<td>
<asp:Label ID="DescriptionLabel" runat="server" Text='<%# Eval("Description") %>' />
</td>
<td>
<asp:Image ID="DistrictImageLabel" runat="server" Height="100px" ImageUrl='<%# "~/Handlers/ImageHandler.ashx?ID="+Eval("DistrictID")+"&Entity=District"%>'/>
</td>
<td>
<asp:Label ID="CityFKLabel" runat="server" Text='<%# Eval("CityFK") %>' />
</td>
</tr>
</SelectedItemTemplate>
</asp:ListView>
<asp:EntityDataSource ID="DistrictEntityDataSource" runat="server" ConnectionString="name=MedicalEntities"
DefaultContainerName="MedicalEntities" EnableDelete="True" EnableFlattening="False" EnableInsert="True"
EnableUpdate="True" EntitySetName="Districts" Include="City" EntityTypeFilter="District">
</asp:EntityDataSource>
So I am trying to bind that dropdownlist values to the CityFK during Insert and Edit operations.

I figured it out. As workaround I added one textbox at the same column with the dropdownlist and set its visible attribute to false;
<asp:TextBox ID="CityFKTextBoxInsert" runat="server" Visible="false" Text='<%# Bind("CityFK") %>' />
In case you also encounter such a problem I add the code-behind and asp side here;
<InsertItemTemplate>
<tr style="">
<td>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
</td>
<td>
<asp:TextBox ID="DistrictIDTextBox" runat="server" Text='<%# Bind("DistrictID") %>' />
</td>
<td>
<asp:TextBox ID="DistrictNameTextBox" runat="server" Text='<%# Bind("DistrictName") %>' />
</td>
<td>
<asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>' />
</td>
<td>
<asp:FileUpload ID="FileUploadDistrictInsert" runat="server" />
</td>
<td>
<asp:TextBox ID="CityFKTextBoxInsert" runat="server" Visible="false" Text='<%# Bind("CityFK") %>' />
<asp:DropDownList ID="CityFKDropDownListInsert" runat="server" AutoPostBack="true" DataSourceID="ddlCityFK_DataSource2" ViewStateMode="Enabled"
DataTextField="CityName" DataValueField="CityID" OnSelectedIndexChanged="CityFKDropDownListInsert_SelectedIndexChanged"
AppendDataBoundItems="true">
<asp:ListItem Text="-Stadt Wählen-" Value="0" ></asp:ListItem>
</asp:DropDownList>
<asp:EntityDataSource ID="ddlCityFK_DataSource2" runat="server"
ConnectionString="name=MedicalEntities" DefaultContainerName="MedicalEntities"
EntitySetName="Cities" >
</asp:EntityDataSource>
</td>
</tr>
</InsertItemTemplate>
Then I have added a "OnSelectedIndexChanged" event to the dropdown and assign the selected value to that textbox;
protected void CityFKDropDownListInsert_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList DropdownDistrict = (DropDownList)DistrictList.InsertItem.FindControl("CityFKDropDownListInsert");
TextBox DistrictTextBox = (TextBox)DistrictList.InsertItem.FindControl("CityFKTextBoxInsert");
DistrictTextBox.Text = DropdownDistrict.SelectedValue;
}
If you want to apply that solution also to EditItemTemplate only thing you have to do changing that line;
DropDownList DropdownDistrict = (DropDownList)DistrictList.InsertItem.FindControl("CityFKDropDownListInsert");
to this;
DropDownList DropdownDistrict = (DropDownList)DistrictList.EditItem.FindControl("CityFKDropDownListInsert");

Ajax TabPanels trigger validation for other tabs in ASP.Net 4.0

I have Ajax TabPanel with Tab "Employee List" "Add Employee" "Edit Employee"
On Employee List Tab i use gridview to display list of employee along with link Button to view details of employee on same tab and "Del" button to delete employee. It worked fine but when i added Controls to Second tab "Add Employee" along with validation controls. After this gridview in Tab one is not working as it trigger validation on second Tab.
How can i stop this validation which is triggered by controls on Tab 1
Below is the code
<asp:TabContainer ID="TabContainer1" runat="server" Height="320px" Width="100%"
ActiveTabIndex="0" >
<asp:TabPanel ID="atpEmployeeList" runat="server" >
<HeaderTemplate>Employee List</HeaderTemplate>
<ContentTemplate>
<table border="0" width="100%" cellpadding="0" cellspacing="0">
<tr>
<td class="style1" align="left" valign="top">
<b>Employee List</b>
<asp:GridView ID="gvEmployeeList" runat="server" AutoGenerateColumns="False"
DataKeyNames="eCode" BackColor="White" BorderColor="#336666"
BorderStyle="None" BorderWidth="2px" CellPadding="4"
GridLines="Horizontal" onrowcommand="gvEmployeeList_RowCommand"
onrowdatabound="gvEmployeeList_RowDataBound" >
<Columns>
<asp:BoundField DataField="eSno" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="eSno" />
<asp:BoundField DataField="eFirstName" HeaderText="First Name"
SortExpression="eFirstName" />
<asp:BoundField DataField="eLastName" HeaderText="Last Name"
SortExpression="eLastName" />
<asp:BoundField DataField="eDepartment" HeaderText="Department"
SortExpression="eDepartment" />
<asp:BoundField DataField="eSalary" HeaderText="Salary"
SortExpression="eSalary" />
<asp:TemplateField HeaderText="Details">
<ItemTemplate>
<asp:LinkButton ID="lnkBtnEmpDetails" CommandArgument='<%# Eval("eSno") %>' CommandName="ViewDetails" runat="server">
View</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:LinkButton ID="lnkBtnEmpDelete" CommandArgument='<%# Eval("eSno") %>' CommandName="Delete" runat="server">
Del</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="White" ForeColor="#333333" />
<HeaderStyle BackColor="#336699" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#336699" ForeColor="White" HorizontalAlign="Right" />
<RowStyle BackColor="White" ForeColor="#333333" />
<SelectedRowStyle BackColor="#339966" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#F7F7F7" />
<SortedAscendingHeaderStyle BackColor="#487575" />
<SortedDescendingCellStyle BackColor="#E5E5E5" />
<SortedDescendingHeaderStyle BackColor="#275353" />
</asp:GridView>
</td>
<td width="250px" align="left" valign="top">
<b>Employee Details</b>
<br />
<table width="280px" align="left" cellpadding="3" cellspacing="0" >
<tr>
<td class="style8" bgcolor="#336699">
Code</td>
<td>
<asp:Label ID="lblEmpCode" runat="server" ></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Fisrt Name</td>
<td>
<asp:Label ID="lblFirstName" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style5" bgcolor="#336699">
Last Name</td>
<td class="style6">
<asp:Label ID="lblLastName" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Designation</td>
<td>
<asp:Label ID="lblDesignation" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Department</td>
<td>
<asp:Label ID="lblDepartment" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Salary</td>
<td>
<asp:Label ID="lblSalary" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Join Date</td>
<td>
<asp:Label ID="lblJoinDate" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Phone</td>
<td>
<asp:Label ID="lblPhone" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
Address</td>
<td>
<asp:Label ID="lblAddress" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style8" bgcolor="#336699">
City</td>
<td>
<asp:Label ID="lblCity" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="style4">
</td>
<td>
</td>
</tr>
</table>
</td>
</tr>
</table>
</ContentTemplate>
</asp:TabPanel>
<asp:TabPanel ID="atpAddEmployee" runat="server" >
<HeaderTemplate>Add Employee</HeaderTemplate>
<ContentTemplate>
<div><b>Enter Details of New Employee</b></div>
<table border="0px"><tr>
<td width="400px">
<div class="spacer"></div>
<div class="row">
<asp:Label ID="lblAEmpCode" CssClass="txtLabel" runat="server" Text="Code :"></asp:Label>
<asp:TextBox ID="txtACode" runat="server" CssClass="txt4Digit"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvCode" runat="server" ErrorMessage="*"
ControlToValidate="txtACode"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblAFN" CssClass="txtLabel" runat="server" Text="First Name :"></asp:Label>
<asp:TextBox ID="txtAFN" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="*"
ControlToValidate="txtAFN"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblALN" CssClass="txtLabel" runat="server" Text="Last Name :"></asp:Label>
<asp:TextBox ID="txtALN" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="*"
ControlToValidate="txtALN"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblADesignation" CssClass="txtLabel" runat="server" Text="Designation :"></asp:Label>
<asp:TextBox ID="txtADesignation" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="*"
ControlToValidate="txtADesignation"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblADepartment" CssClass="txtLabel" runat="server" Text="Department :"></asp:Label>
<asp:TextBox ID="txtADepartment" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ErrorMessage="*"
ControlToValidate="txtADepartment"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblASalary" CssClass="txtLabel" runat="server" Text="Salary :"></asp:Label>
<asp:TextBox ID="txtASalary" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server" ErrorMessage="*"
ControlToValidate="txtASalary"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblAJoinDate" CssClass="txtLabel" runat="server" Text="Join Date :"></asp:Label>
<asp:TextBox ID="txtAJoinDate" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server" ErrorMessage="*"
ControlToValidate="txtAJoinDate"></asp:RequiredFieldValidator>
</div>
</td>
<td width="400px">
<div class="spacer"></div>
<div class="row">
<asp:Label ID="lblAAddress" CssClass="txtLabel" runat="server" Text="Address :"></asp:Label>
<asp:TextBox ID="txtAAddress" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ErrorMessage="*"
ControlToValidate="txtAAddress"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblACity" CssClass="txtLabel" runat="server" Text="City :"></asp:Label>
<asp:TextBox ID="txtACity" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator8" runat="server" ErrorMessage="*"
ControlToValidate="txtACity"></asp:RequiredFieldValidator>
</div>
<div class="row">
<asp:Label ID="lblACountry" CssClass="txtLabel" runat="server" Text="Country :"></asp:Label>
<asp:UpdatePanel ID="updatepanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddCountry" runat="server" CssClass="ddGeneral" DataTextField="Country"
DataValueField="CountryId" OnSelectedIndexChanged="ddCountry_SelectedIndexChanged"
AutoPostBack="true" AppendDataBoundItems="true" >
<asp:ListItem Value="0">Select Country</asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<div class="row">
<asp:Label ID="lblAState" CssClass="txtLabel" runat="server" Text="State :"></asp:Label>
<asp:UpdatePanel ID="updatePnlState" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddState" runat="server" CssClass="ddGeneral" DataTextField="Region" DataValueField="RegionId" AppendDataBoundItems="true">
<asp:ListItem Value="0">Select State</asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="updProgLoading" runat="server" >
<ProgressTemplate>
<img src="images/ajax-loader-small.gif" align="left" alt="Loading..." vspace="0" />
</ProgressTemplate>
</asp:UpdateProgress>
</div>
<div class="row">
<asp:Label ID="lblALL" CssClass="txtLabel" runat="server" Text="Landline :"></asp:Label>
<asp:TextBox ID="txtALL" runat="server" CssClass="txtbox"></asp:TextBox>
</div>
<div class="row">
<asp:Label ID="lblAMobile" CssClass="txtLabel" runat="server" Text="Mobile :"></asp:Label>
<asp:TextBox ID="txtAMobile" runat="server" CssClass="txtbox"></asp:TextBox>
</div>
<div class="row">
<asp:Label ID="lblAEmail" CssClass="txtLabel" runat="server" Text="Email :"></asp:Label>
<asp:TextBox ID="txtAEmail" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator13" runat="server" ErrorMessage="*"
ControlToValidate="txtAEmail"></asp:RequiredFieldValidator>
</div>
</td>
</tr>
<tr><td colspan="2" align="center" height="40px">
<asp:Button ID="btnAddEmployee" runat="server" Text="Add Employee"
CssClass="btn" onclick="btnAddEmployee_Click" /> <input id="Reset1" type="reset" class="btn" value="Reset" />
</td></tr>
</table>
</ContentTemplate>
</asp:TabPanel>
<asp:TabPanel ID="atpEditEmployee" runat="server" >
<HeaderTemplate>Edit Employee</HeaderTemplate>
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<input id="Button2" type="button" value="Next" onclick="MoveTab(1)" />
</ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>

You should look at utilising the ValidationGroup attribute for validators. For example for all the validators in the atpAddEmployee tab you would set the attribute like so ValidationGroup="atpAddEmployee" or any other name that you think appropriate.
I've taken one of the validators from the atpAddEmployee tab and added the attribute as described above.
<asp:RequiredFieldValidator ID="rfvCode" runat="server" ErrorMessage="*" ControlToValidate="txtACode" ValidationGroup="atpAddEmployee"></asp:RequiredFieldValidator>
For that particular tab you would also need to add the ValidationGroup attribute to the button that should trigger the validation, see below.
<asp:Button ID="btnAddEmployee" runat="server" Text="Add Employee" CssClass="btn" onclick="btnAddEmployee_Click" ValidationGroup="atpAddEmployee" />
Some further reading, MSDN and W3Schools.

modal popup extender problem

i use modal popup extender to show my details in another separate window it is a panel contains some controls the problem is ::
when i click on my button which contains::
the Show() method the parent page just frozen and no popup appears at all on the other side i have a grid view when i click on the last button on it the popup appears where the other buttons on the grid view make the same behavior of my first button , i donot know what is the problem my panel visibility = true and no setting in my behind code..i view the source and i find the panel with its contents then why the popup window doesnot appear..i search alot but i donot find a solution to my problem ..
my aspx::
<asp:Panel id="master_editMode" runat="server" >
<div id="masterDiv" style="width:98%" dir="rtl">
<div id="masterControls" align="center">
<table border="0" width="98%">
<tr>
<td align="center" dir="rtl">
<asp:ObjectDataSource ID="ObjDS_AllTasks" runat="server"
SelectMethod="Get_All_Tasks" TypeName="DocumentFlowModuleDTO.TaskDTO">
</asp:ObjectDataSource>
<asp:HiddenField ID="hd_Task_Code" runat="server" />
<table>
<tr>
<td>
<asp:Label ID="Label11" runat="server" Text="Search for Task" Visible="False"></asp:Label>
</td>
<td align="right">
<asp:TextBox ID="txt_Search" runat="server" AutoPostBack="True"
ontextchanged="txt_Search_TextChanged" Width="200px" Visible="False"></asp:TextBox>
</td>
<td>
</td>
</tr>
<tr>
<td colspan="3">
<asp:GridView ID="grd_AllTasks" runat="server" AllowPaging="True"
AutoGenerateColumns="False" CssClass="Alternating" DataKeyNames="task_code"
DataSourceID="ObjDS_AllTasks"
onpageindexchanging="grd_AllTasks_PageIndexChanging"
onrowdatabound="grd_AllTasks_RowDataBound" style="margin-right: 0px">
<RowStyle VerticalAlign="Top" />
HeaderText="ÍÐÝ">
<ItemTemplate>
<asp:ImageButton ID="btn_Delete_Task" runat="server"
CommandArgument="<%# Bind('task_code') %>" Height="33px"
ImageUrl="~/Images/delete.png" oncommand="btn_Delete_Task_Command"
Width="67px" />
<cc1:ConfirmButtonExtender ID="btn_Delete_Task_ConfirmButtonExtender"
runat="server" ConfirmText="åá ÊÑíÏ ÍÐÝ æËíÞÉ ÇáÇÚÊãÇÏ ¿" Enabled="True"
TargetControlID="btn_Delete_Task">
</cc1:ConfirmButtonExtender>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle HorizontalAlign="Right" />
</asp:GridView>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="right" dir="rtl">
<asp:Label ID="lbl_TaskName" runat="server" Font-Bold="True" Font-Size="13pt"></asp:Label>
</td>
</tr>
<tr>
<td align="center" dir="rtl" style="height: 196px">
<table>
<tr>
<td align="left">
<asp:Label ID="lbl_No_States" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label>
</td>
<td align="right">
<asp:ImageButton ID="btn_AddStatesToTask" runat="server"
ImageUrl="Images/add.png" onclick="btn_AddStatesToTask_Click" Visible="False" />
<asp:Button ID="Dummy_btn2" runat="server" Text="Button" Style="display:none;" />
<cc1:ModalPopupExtender ID="btn_AddStatesToTask_ModalPopupExtender"
runat="server"
TargetControlID="Dummy_btn2"
BackgroundCssClass="modalBackground"
PopupControlID="pnl_Add_States"
DropShadow="True">
</cc1:ModalPopupExtender>
</td>
</tr>
</table>
<asp:HiddenField ID="hd_StateSerial" runat="server" />
<asp:HiddenField ID="hd_StateRowIndex" runat="server" />
<asp:GridView ID="grd_States" runat="server" AllowPaging="True" DataKeyNames="state_serial"
onpageindexchanging="grd_States_PageIndexChanging" Visible="False"
CssClass="Alternating" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="state_name" HeaderText="ÇáãÑÍáÉ"
ShowHeader="False" />
<asp:BoundField DataField="state_order" HeaderText="ÊÑÊíÈ ÇáãÑÍáÉ"
ShowHeader="False" />
<asp:TemplateField HeaderText="Power" ShowHeader="False">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="chb_StatePower" runat="server"
Checked='<%# Convert.ToBoolean(Eval("power_flag")) %>' Enabled="False" />
</ItemTemplate>
<ItemStyle Width="40px" />
</asp:TemplateField>
<asp:TemplateField HeaderText="New" ShowHeader="False">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox3" runat="server" />
<asp:Button ID="Dummy_btn4" runat="server" Text="Button" Style="display:none;" />
<cc1:ModalPopupExtender ID="btn_TaskState_Edit_ModalPopupExtender" runat="server"
TargetControlID="Dummy_btn4"
BackgroundCssClass="modalBackground"
PopupControlID="pnl_Add_States"
DropShadow="True">
</cc1:ModalPopupExtender>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ÍÐÝ" ShowHeader="False">
<ItemTemplate>
<asp:ImageButton ID="btn_TaskState_Delete" runat="server"
CommandArgument="<%# Bind('state_serial') %>" Height="26px"
ImageUrl="~/Images/delete.png" oncommand="btn_TaskState_Delete_Command"
Width="47px" />
<cc1:ConfirmButtonExtender ID="btn_TaskState_Delete_ConfirmButtonExtender"
runat="server" ConfirmText="åá ÊÑíÏ ÍÐÝ ÇáãÑÍáÉ ¿" Enabled="True"
TargetControlID="btn_TaskState_Delete">
</cc1:ConfirmButtonExtender>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</td>
</tr>
<tr>
<td>
<asp:ObjectDataSource ID="ObjectDataSource_States" runat="server"
SelectMethod="Select_TaskStates" TypeName="DocumentFlowModule.DTO.TaskStateDTO">
<SelectParameters>
<asp:Parameter Name="task_code" Type="Int32" />
</SelectParameters>
</asp:ObjectDataSource>
</td>
</tr>
</table>
</div>
</div>
</asp:Panel>
<asp:Panel ID="pnl_Add_Task" runat="server" CssClass="modalPopup"><%-- Style="display:none;"--%>
<div id="div3" style="width: 95%">
<div id="div4" align="center">
<table>
<tr>
<td>
<asp:UpdatePanel ID="UpPnl1" runat="server">
<ContentTemplate>
<table dir="rtl" style="text-align: right">
<tr bgcolor="#f1ece2">
<th align="right" height="35" valign="middle" colspan="3">
<asp:Label ID="lbl_New_Task" runat="server" Font-Bold="False" Font-Size="14pt"
Text="ÅÖÇÝÉ æËíÞÉ ÇÚÊãÇÏ" Visible="False"></asp:Label>
<asp:Label ID="lbl_Edit_Task" runat="server" Font-Bold="False" Font-Size="14pt"
Text="ÊÚÏíá æËíÞÉ ÇÚÊãÇÏ" Visible="False"></asp:Label>
</th>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label1" runat="server" Text="Task Name"></asp:Label>
</td>
<td style="width: 140px">
<asp:TextBox ID="txt_TaskName" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txt_TaskName" ErrorMessage="*" ValidationGroup="G1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label10" runat="server" Text="DataBase Name"></asp:Label>
</td>
<td style="width: 140px">
<asp:DropDownList ID="ddl_DataBases" runat="server" AutoPostBack="True"
ondatabound="ddl_DataBases_DataBound"
onselectedindexchanged="ddl_DataBases_SelectedIndexChanged">
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
ControlToValidate="ddl_DataBases" ErrorMessage="*" InitialValue="--Select--"
ValidationGroup="G1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label2" runat="server" Text="Table Name"></asp:Label>
</td>
<td style="width: 140px">
<asp:DropDownList ID="ddl_Tables" runat="server" AutoPostBack="True"
ondatabound="ddl_Tables_DataBound"
onselectedindexchanged="ddl_Tables_SelectedIndexChanged">
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
ControlToValidate="ddl_Tables" ErrorMessage="*" InitialValue="--Select--"
ValidationGroup="G1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label17" runat="server" Text="Table Key"></asp:Label>
</td>
<td style="width: 140px">
<asp:Label ID="lbl_Key" runat="server"></asp:Label>
<asp:CheckBoxList ID="cbl_Columns" runat="server">
</asp:CheckBoxList>
</td>
<td>
<asp:Label ID="lbl_Select_Key" runat="server" ForeColor="Red"></asp:Label>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label18" runat="server" Text="Current Record State"></asp:Label>
</td>
<td style="width: 140px">
<asp:DropDownList ID="ddl_Columns" runat="server" AutoPostBack="True"
ondatabound="ddl_Columns_DataBound">
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="ddl_Columns" ErrorMessage="*" InitialValue="--Select--"
ValidationGroup="G1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label5" runat="server" Text="Form View "></asp:Label>
</td>
<td style="width: 140px">
<asp:TextBox ID="txt_F_View" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server"
ControlToValidate="txt_F_View" ErrorMessage="*" InitialValue="--Select--"
ValidationGroup="G1"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="title" width="160">
<asp:Label ID="Label6" runat="server" Text="Form New"></asp:Label>
</td>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td dir="rtl" align="center">
<asp:ImageButton ID="btn_OK" runat="server" ImageUrl="~/Images/add.png"
onclick="btn_OK_Click" ValidationGroup="G1" Visible="False" />
<asp:ImageButton ID="btn_Edit" runat="server" ImageUrl="~/Images/edit.png"
onclick="btn_Edit_Click" ValidationGroup="G1" Visible="False" />
<asp:ImageButton ID="btn_Cancel_Task" runat="server" CausesValidation="False"
Height="36px" ImageUrl="~/Images/cancel.png" onclick="btn_Cancel_Task_Click" />
</td>
</tr>
</table>
</div>
</div>
</asp:Panel>
the btn_add _task does not make my popup appear just freeze the parent page
my .cs
protected void btn_Add_Task_Click(object sender, EventArgs e)
{
//AjaxControlToolkit.ModalPopupExtender modal1 = (AjaxControlToolkit.ModalPopupExtender) table1.FindControl("btn_Add_Task_ModalPopupExtender");
//modal1.Show();
grd_States.Visible = false;
lbl_No_States.Text = "";
btn_AddStatesToTask.Visible = false;
lbl_TaskName.Text = "";
//master_editMode.Visible = true;
//pnl_Add_Task.Visible = true;
btn_OK.Visible = true;
btn_Edit.Visible = false;
lbl_New_Task.Visible = true;
lbl_Edit_Task.Visible = false;
txt_TaskName.Text = "";
ddl_DataBases.ClearSelection();
ddl_Tables.Items.Clear();
ddl_Columns.Items.Clear();
cbl_Columns.Items.Clear();
txt_F_New.Text = "";
txt_F_View.Text = "";
txt_Params.Text = "";
txt_SP_Name.Text = "";
btn_Add_Task_ModalPopupExtender.Show();
}
thanks in advance
EDITED::
<table align="center" dir="rtl">
<tr>
<td >
<asp:Button ID="Dummy_btn" runat="server" Text="Button" Style="display:none;" />
<asp:Button ID="btn_Add_Task" runat="server" Text="ÅÖÇÝÉ æËíÞÉ ÇÚÊãÇÏ ÌÏíÏÉ"
onclick="btn_Add_Task_Click" Font-Bold="True" Font-Size="12pt"
ForeColor="#0066FF" />
<cc1:ModalPopupExtender ID="btn_Add_Task_ModalPopupExtender" runat="server"
TargetControlID="Dummy_btn"
PopupControlID="pnl_Add_Task"
BackgroundCssClass="modalBackground"
DropShadow="True" >
</cc1:ModalPopupExtender>
</td>
</tr>
</table>`

If you want your modal popup to be displayed when the user clicks on the btn_Add_Task button, you should set that button as the TargetControlID of the extender:
<cc1:ModalPopupExtender ID="btn_Add_Task_ModalPopupExtender" runat="server"
TargetControlID="btn_Add_Task" PopupControlID="pnl_Add_Task"
BackgroundCssClass="modalBackground" DropShadow="True" />
In your current code, the modal popup is triggered by a button named Dummy_btn, which I can't find in your markup, but which probably isn't what you want.

We had many issues with ajax popup. you might want to try the approach we have been using for past one month or so with out any issues. This approach creates a popup with out need of ajax / jquery / javascript /css/ update panel .
here:
A modal popup with out using ajax, update panel, jquery or javascript- surprisingly this seems to work