I am trying to have the ddl bound when the search box returns a result. The DDL is bound as follows:
<asp:TemplateField HeaderText="Service Area" SortExpression="ServiceArea">
<EditItemTemplate>
<asp:DropDownList ID="drp_Val_ServiceArea" runat="server" DataTextField="ServiceArea"
DataValueField='<%# Eval("ServiceAreaId") %>'>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lbl_Bind_ServiceArea" runat="server" Text='<%# Bind("ServiceArea") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
The page loads fine when I use the search and the grid loads.
When I press the edit button the exception is Object not set to an instance.
And errors on ddl.DataTextField = "ServiceArea".
protected void grd_User_RowEditing(object sender, GridViewEditEventArgs e)
{
grd_User.EditIndex = e.NewEditIndex;
using (var _db = new dbDataContext())
{
var result = from s in _db.tbl_ServiceAreas
where s.Deleted == false
select new
{
s.ServiceAreaId,
s.ServiceArea
};
if ((DataControlRowState.Edit) > 0)
{
DropDownList ddl = (DropDownList)grd_User.Rows[e.NewEditIndex].Cells[0].FindControl("drp_Val_ServiceArea");
ddl.DataTextField = "ServiceArea";
ddl.DataValueField = "ServiceAreaId";
ddl.DataSource = result;
ddl.DataBind();
}
}
LoadGrid();
}
Is this because the grid is already bound to the ServiceArea?
Below is the Answer I have been looking for.
protected void grd_User_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowState == DataControlRowState.Edit)
{
DropDownList ddl = (DropDownList)e.Row.FindControl("drp_Val_ServiceArea");
using (var _db = new dbDataContext())
{
var result = from s in _db.tbl_Users
where s.Deleted == false
select new
{
s.ServiceAreaId,
s.tbl_ServiceArea.ServiceArea
};
foreach (var item in result)
{
ddl.DataTextField = item.ServiceArea;
ddl.DataValueField = item.ServiceAreaId.ToString();
ddl.DataSource = result;
ddl.DataBind();
}
}
}
}
Related
How do i get id of column in grid view c# asp.net using a button and the open another web-part that will collect information fromsl server using that id from grid-view?
I have done this for my grid view:
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnView" runat="server" Text="View" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And for the information from sqlserver that is being filled in gridview the code is:
protected void GridView_Load(object sender, EventArgs e)
{
using (DBEntitiesModelConn DbContext = new DBEntitiesModelConn())
{
try
{
GridView.AutoGenerateColumns = true;
var ApplicationData = from i in DbContext.DBEntity
select new
{
CompanyName = i.Name.ToString(),
ApplicationStatus = i.Status.ToString(),
ApplicationDate = i.DateSubmitted.ToString(),
ApplicationID = i.ID.ToString(),
};
GridView.DataSource = ApplicationData.ToList();
GridView.DataBind();
}
catch (System.Data.SqlClient.SqlException ex)
{
ErrorMessage.Text = ex.Message.ToString();
}
}
}
protected void OnRowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes["onclick"] = Page.ClientScript.GetPostBackClientHyperlink(ViewApplicationsGrid, "Select$" + e.Row.RowIndex);
e.Row.ToolTip = "Click to select this row.";
}
}
I am creating dynamic Template Fields for my gridview:
<asp:GridView ID="grdData" runat="server" DataKeyNames = "ID" AutoGenerateColumns="false" OnRowDataBound="grdData_RowDataBound">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="chkAll" AutoPostBack="true" OnCheckedChanged="OnCheckedChanged" runat="server" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="editbtn" AutoPostBack="true" OnCheckedChanged="OnCheckedChanged" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
the code to add templateField is below:
private void BindGridView(DataTable dtData)
{
foreach (DataColumn item in dtData.Columns)
{
TemplateField tfield = new TemplateField();
tfield.HeaderText = item.ToString();
grdData.Columns.Add(tfield);
}
grdData.DataSource = dtData;
ViewState["dtDataTable"] = dtData;
grdData.DataBind();
}
and in row databound I am adding textbox and label to the templatefield:
protected void grdData_RowDataBound(object sender, GridViewRowEventArgs e)
{
DataTable dtData = (DataTable)ViewState["dtDataTable"];
if (e.Row.RowType == DataControlRowType.DataRow)
{
int i = 1;
foreach (DataColumn item in dtData.Columns )
{
TextBox txtBox = new TextBox();
txtBox.ID = "txt"+item.ToString();
txtBox.Text = (e.Row.DataItem as DataRowView).Row[item.ToString()].ToString();
txtBox.Visible = false;
e.Row.Cells[i].Controls.Add(txtBox);
Label lblBox = new Label();
lblBox.ID = "lbl" + item.ToString();
lblBox.Text = (e.Row.DataItem as DataRowView).Row[item.ToString()].ToString();
e.Row.Cells[i].Controls.Add(lblBox);
i++;
}
}
}
Everything is working good so far,The grid is getting created and the values are getting populated ,but when i am calling below method and try to access the gridview control ,its throwing object reference error:
protected void OnCheckedChanged(object sender, EventArgs e)
{
bool isUpdateVisible = false;
CheckBox chk = (sender as CheckBox);
if (chk.ID == "chkAll")
{
foreach (GridViewRow row in grdData.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
row.Cells[0].Controls.OfType<CheckBox>().FirstOrDefault().Checked = chk.Checked;
}
}
}
CheckBox chkAll = (grdData.HeaderRow.FindControl("chkAll") as CheckBox);
chkAll.Checked = true;
foreach (GridViewRow row in grdData.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
bool isChecked = row.Cells[0].Controls.OfType<CheckBox>().FirstOrDefault().Checked;
for (int i = 1; i < row.Cells.Count; i++)
{
Label test= row.FindControl("lblName") as Label;//this is coming null
Below code lines are throwing object reference error as they are not able to find control
row.Cells[i].Controls.OfType<Label>().FirstOrDefault().Visible = !isChecked;//this line throwing object reference error
if (row.Cells[i].Controls.OfType<TextBox>().ToList().Count > 0)
{
row.Cells[i].Controls.OfType<TextBox>().FirstOrDefault().Visible = isChecked;
}
if (row.Cells[i].Controls.OfType<DropDownList>().ToList().Count > 0)
{
row.Cells[i].Controls.OfType<DropDownList>().FirstOrDefault().Visible = isChecked;
}
if (isChecked && !isUpdateVisible)
{
isUpdateVisible = true;
}
if (!isChecked)
{
chkAll.Checked = false;
}
}
}
}
btnUpdate.Visible = isUpdateVisible;
}
Edit:
I tried reinistialising the controls in preinit event but still no luck:
protected void Page_PreInit(object sender, EventArgs e)
{
if (ViewState["gridData"] != null)
{
BindGridView((DataTable)ViewState["gridData"]);
}
}
What I am doing wrong?
I recreated the dynamic gridview Controls in OnRowCreated as this event gets called in every postback instead of onRowDataBound Event and it worked like charm.
This is my code behind code. I want to populate the DropDownList once the user clicked edit but the DropDownList I'm getting is null. Why?
protected void SupportSchedule_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "EditRow")
{
int rowIndex = ((GridViewRow)((ImageButton) e.CommandSource).NamingContainer).RowIndex;
GridViewRow row = (GridViewRow)(((ImageButton) e.CommandSource).NamingContainer);
SupportScheduleTable.EditIndex = rowIndex;
shift.Enabled = true;
resourcedate.Enabled = true;
ListItemCollection c = db.fillList();
DropDownList ddl1 = row.FindControl("ddlshiftmanager") as DropDownList;
DropDownList ddl2 = row.FindControl("ddldispatcherone") as DropDownList;
DropDownList ddl3 = row.FindControl("ddldispatchertwo") as DropDownList;
if (c != null && ddl1 != null)
{
ddl1.DataSource = c;
ddl2.DataSource = c;
ddl3.DataSource = c;
ddl1.DataBind();
ddl2.DataBind();
ddl3.DataBind();
}
getSupportSchedule();
}
else if (e.CommandName == "CancelUpdate")
{
//some codes here
} else if (e.CommandName == "UpdateRow")
{
//some codes here
}
}
//asp code
<asp:GridView ID="SupportScheduleTable" AutoGenerateColumns="False" Width="100%" runat="server" OnRowCommand="SupportSchedule_RowCommand">
<Columns>
<asp:TemplateField HeaderText="Shift Manager">
<EditItemTemplate>
<asp:DropDownList ID="ddlshiftmanager" runat="server" Width="99%"></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("shift_manager") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle Width="32%" />
</asp:TemplateField>
<asp:TemplateField ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:ImageButton ID="lbEdit" CssClass="btn" ImageUrl="~/Files/edit.png" CommandArgument='<%# Eval("support_schedule_id") %>' CommandName="EditRow" runat="server"></asp:ImageButton>
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="lbUpdate" CommandArgument='<%# Eval("support_schedule_id") %>' CommandName="UpdateRow" runat="server">Update</asp:LinkButton>
<asp:LinkButton ID="lbCancel" CommandArgument='<%# Eval("support_schedule_id") %>' CommandName="CancelUpdate" runat="server" CausesValidation="false">Cancel</asp:LinkButton>
</EditItemTemplate>
<HeaderStyle Width="2%" />
</asp:TemplateField>
//two dropdownlists before image button
</Columns>
</GridView>
I just added the ImageButton here in the recent update but this is my original code that doesn't work.
I used a SqlDataSource instead of adding the list items from the back
and this is what I used to get the selected value of the DropDownList.
else if (e.CommandName == "UpdateRow")
{
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
DropDownList ddlshift = (DropDownList)SupportScheduleTable.Rows[rowIndex].FindControl("ddlshiftmanager");
DropDownList ddlone = (DropDownList)SupportScheduleTable.Rows[rowIndex].FindControl("ddldispatcherone");
DropDownList ddltwo = (DropDownList)SupportScheduleTable.Rows[rowIndex].FindControl("ddldispatchertwo");
string manager = ddlshift.SelectedValue;
string one = ddlone.SelectedValue;
string two = ddltwo.SelectedValue;
int supportID = Convert.ToInt32(e.CommandArgument);
String sh = shift.Text;
String date = resourcedate.Text;
db.updateSS(supportID, sh, manager, one, two,date);
SupportScheduleTable.EditIndex = -1;
shift.Enabled = false;
resourcedate.Enabled = false;
getSupportSchedule();
}
Your answer is a correct way to handle the issue you are seeing. But, in case you didn't figure out the actual cause...
The ImageButton you click is in your ItemTemplate. The DropDownList you want to bind is in your EditItemTemplate. lbEdit exists when you are not in edit mode but ddlshiftmanager only exists when you are.
So, the fix is to put the GridView in edit mode. Notice that this is something you actually already started to do. You need to set the EditIndex, re-bind the GridView, then get the row again. You'll then have the row in edit mode. This row should now contain ddlshiftmanager.
protected void SupportSchedule_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "EditRow")
{
int rowIndex = ((GridViewRow)((ImageButton) e.CommandSource).NamingContainer).RowIndex;
// Set the index to edit
SupportScheduleTable.EditIndex = rowIndex;
// Re-bind the GridView to put it in edit mode
SupportScheduleTable.DataSource = /* your data source */
SupportScheduleTable.DataBind();
// Get the row at the index. The row will be the
// row reflected in edit mode.
GridViewRow editRow = SupportScheduleTable.Rows[rowIndex];
// Find your DropDownLists in this edit row
DropDownList ddl1 = editRow.FindControl("ddlshiftmanager") as DropDownList;
DropDownList ddl2 = editRow.FindControl("ddldispatcherone") as DropDownList;
DropDownList ddl3 = editRow.FindControl("ddldispatchertwo") as DropDownList;
shift.Enabled = true;
resourcedate.Enabled = true;
ListItemCollection c = db.fillList();
if (c != null && ddl1 != null)
{
ddl1.DataSource = c;
ddl2.DataSource = c;
ddl3.DataSource = c;
ddl1.DataBind();
ddl2.DataBind();
ddl3.DataBind();
}
getSupportSchedule();
}
// Everything else...
}
I have created user control named CRE.ascx,this control has 3 dropdownlist.
First dropdownlist bind data on pageload.Second and third based on SelectedIndexChanged.
<table cellspacing="0" cellspading="0" style="width:550px;height:30px;">
<tr>
<td style="width:30%;">
<asp:DropDownList ID="ddlCRE" runat="server" Height="20px" Width="145px" OnSelectedIndexChanged="ddlCRE_SelectedIndexChanged" AutoPostBack="true">
</asp:DropDownList>
</td>
<td style="width:30%;">
<asp:DropDownList ID="ddlDataPoints" runat="server" Height="20px" Width="145px" OnSelectedIndexChanged="ddlDataPoints_SelectedIndexChanged" AutoPostBack="true">
</asp:DropDownList>
</td>
<td style="width:30%;">
<asp:DropDownList ID="ddlErrorCode" runat="server" Height="20px" Width="145px" OnSelectedIndexChanged="ddlErrorCode_SelectedIndexChanged" AutoPostBack="true">
</asp:DropDownList>
</td>
<td style="width:10%;">
<asp:TextBox ID="tbxErrorScore" runat="server" style="height:17px;border:0px;font-family:'Segoe UI';font-size:13px;font-weight:500;color:white;background-color:#333333;
width:65px;" ReadOnly="true"> </asp:TextBox>
</td>
</tr>
</table>
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Get Ticket Type Values
dbtickettype = helpdsktcktusrHandler.GetTicketType("DPT0001");
ddlCRE.DataSource = dbtickettype;
ddlCRE.DataValueField = "Type_ID";
ddlCRE.DataTextField = "Type_Name";
ddlCRE.DataBind();
ddlCRE.Items.Insert(0, new ListItem("Select Type", "SLCT0000"));
}
else
{
}
}
protected void ddlCRE_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedTypeID = ddlCRE.SelectedValue.ToString();
try
{
if (selectedTypeID == "SLCT0000")
{
ddlDataPoints.Items.Clear();
ddlErrorCode.Items.Clear();
tbxErrorScore.Text = string.Empty;
}
else
{
//Get Category Details
dbticketCategory = helpdsktcktusrHandler.GetTicketCategoryDetails(selectedTypeID);
//Binding Ticket Type values to Listbox
ddlDataPoints.DataSource = dbticketCategory;
ddlDataPoints.DataValueField = "Category_ID";
ddlDataPoints.DataTextField = "Category_Name";
ddlDataPoints.DataBind();
ddlDataPoints.Items.Insert(0, new ListItem("Select Category", "SLCT0000"));
//Clear Items
ddlErrorCode.Items.Clear();
tbxErrorScore.Text = string.Empty;
}
}
catch (Exception ex)
{
}
}
protected void ddlDataPoints_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedCatID = ddlDataPoints.SelectedValue.ToString();
try
{
if (selectedCatID == "SLCT0000")
{
ddlErrorCode.Items.Clear();
tbxErrorScore.Text = string.Empty;
}
else
{
//Get Category Details
dbticketSubCategory = helpdsktcktusrHandler.GetTicketSubCategoryDetails(selectedCatID);
//Binding Ticket Type values to Listbox
ddlErrorCode.DataSource = dbticketSubCategory;
ddlErrorCode.DataValueField = "Sub_Category_ID";
ddlErrorCode.DataTextField = "Sub_Category_Name";
ddlErrorCode.DataBind();
ddlErrorCode.Items.Insert(0, new ListItem("Select Subcategory", "SLCT0000"));
//Clear Items
tbxErrorScore.Text = string.Empty;
}
}
catch (Exception ex)
{
}
}
protected void ddlErrorCode_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedSubcatID = ddlErrorCode.SelectedValue.ToString();
try
{
if (selectedSubcatID == "SLCT0000")
{
tbxErrorScore.Text = string.Empty;
}
else
{
//Get Category Details
dbticketIssues = helpdsktcktusrHandler.GetTicketIssueDetails(selectedSubcatID);
////Binding Ticket Type values to Listbox
//ddlstIssue.DataSource = dbticketIssues;
//ddlstIssue.DataValueField = "IssueID";
//ddlstIssue.DataTextField = "Issue_Name";
//ddlstIssue.DataBind();
tbxErrorScore.Text = dbticketIssues.Rows[0][1].ToString();
}
}
catch (Exception ex)
{
}
}
then register directive and an instance of the user control added to the page.
In this main page, i have added one Gridview, user control UC1 and two buttons
included in the ItemTemplate.
<%# Register src="~/CRE.ascx" TagName="InsertNewCRE" TagPrefix="uc1" %>
<asp:UpdatePanel ID="MainUpdatePanel" runat="server">
<ContentTemplate>
<div id="dvsubCRE" class="dvsubCRE" runat="server">
<!-----[[[ GRIDVIEW ADDING CRE ]]]----->
<div id="dvAddingErrorInfo" class="dvAddingErrorInfo">
<!-- LOAD CRE DROPDOWN INFO GRID -->
<asp:GridView ID="gvCREInfo" runat="server" CssClass="gvErrorInfo" AlternatingRowStyle-CssClass="" ShowFooter="false" ShowHeader="false"
EnableViewState="True" GridLines="None" EmptyDataText="No records found" AutoGenerateColumns="true" CaptionAlign="Left" CellPadding="0"
ShowHeaderWhenEmpty="True" OnRowCreated="gvCREInfo_RowCreated" OnRowCommand="gvCREInfo_RowCommand" >
<Columns>
<asp:BoundField DataField="RowNumber" />
<asp:TemplateField ItemStyle-Width="25%" ItemStyle-Height="20px">
<ItemTemplate>
<uc1:InsertNewCRE id="UC1InserCRE" runat="server" EnableViewState="true" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Width="5%">
<ItemTemplate>
<asp:ImageButton ID="imgbtnAddCRE" runat="server" Width="20px" Height="20px" value="" ImageUrl="~/Images/Tracker/add.png"
CommandName="ButtonAddCRERow" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
<asp:ImageButton ID="imgbtnReoveCRE" runat="server" Width="20px" Height="20px" value="" Visible="false" ImageUrl="~/Images/Tracker/delete.png" CommandName="ButtonRemoveCRERow" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<!-- LOAD CRE DROPDOWN INFO GRID CLOSE -->
</div>
<!-----[[[ GRIDVIEW ADDING CRE CLOSE ]]]----->
</div>
</ContentTemplate>
</asp:UpdatePanel>
When main page loads, user control UC1 loaded in the gridview and pull out the data from CRE.ascx page.I have bind dummy data on page load to the gridview.Add new row along with user control mentioned in the RowCommand.
protected void Page_Load(object sender, EventArgs e)
{
try
{
if (!IsPostBack)
{
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
dr = dt.NewRow();
dr["RowNumber"] = 1;
dt.Rows.Add(dr);
ViewState["CurrentTable"] = dt;
gvCREInfo.DataSource = dt;
gvCREInfo.DataBind();
}
else
{
}
}
catch (Exception ex)
{
}
}
protected void gvCREInfo_RowCommand(object sender, GridViewCommandEventArgs e)
{
#region ADD NEW CRE ROW
if (e.CommandName == "ButtonAddCRERow")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = gvCREInfo.Rows[index];
int count = gvCREInfo.Rows.Count;
DataRow drCurrentRow = null;
UserControl UC1 = (UserControl)(row.Cells[0].FindControl("UC1InserCRE"));
DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
for (int i = 0; i <= (count - 1); i++)
{
drCurrentRow = dtCurrentTable.NewRow();
dtCurrentTable.Rows.Add(drCurrentRow);
}
gvCREInfo.DataSource = dtCurrentTable;
gvCREInfo.DataBind();
}
#endregion
}
When i run this code working fine and i changed the first dropdownlist
it will pull data and bind to the second, like wise third one also.But when i click the add button selected data lost in the first row and second row control added not with data.How to retain existing selected data and load user control along with data it should not loss data event post back.Please help me and sort out this.
![enter image description here][1]
http://i.stack.imgur.com/wdYZv.jpg
I can't find an answer anywhere... I have a List<string[]> populated like this:
...
while (myReader.Read())
{
string[] row = new string[myInt];
for (int i = 0; i < myInt; i++)
{
row[i] = myReader[i].ToString();
}
myList.Add(row);
}
...
How do I bind this list to a gridview with TemplateField columns?
An easier way is to create an anonymous class and bind that to your GridView. Example:
var query = from c in row
select new { SomeProperty = c };
GridView.DataSource=query;
GridView.DataBind();
You can always use the RowDataBound event of the GridView
<asp:GridView ID="gridView1" runat="server"
OnRowDataBound="gridView1_DataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="myLabel" runat="server"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
When binding your data:
var myStrings = new List<string[]>
{
new [] { "hello", "bye"},
new [] { "1", "2"}
};
gridView1.DataSource = myStrings;
gridView1.DataBind();
RowDataBound event:
public void gvDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType != DataControlRowType.DataRow)
{
return;
}
var item = (string[]) e.Row.DataItem;
Label myLabel = e.Row.FindControl("myLabel") as Label;
myLabel.Text = item[0];
}
Simply use databind as you normally would. To reference the column, it goes by index by default. So like this:
<asp:GridView runat="server" AutoGenerateColumns="false" ID="rpt">
<Columns>
<ItemTemplate>
<%# Eval("Key") %>
</ItemTemplate>
</Columns>
</asp:Repeater>
Dictionary<string, string> lst = new Dictionary<string, string>();
lst.Add("test", String.Empty);
lst.Add("test1", String.Empty);
this.rpt.DataSource = lst;
this.rpt.DataBind();