Develop Reference

Unusable elements inside the (list view ) asp.net

Why can't I use the (input) I put in my (list view) in the C # code field?
<asp:ListView ID="ListV" runat="server">
<ItemTemplate runat="server">
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
<tr class="text-center">
<td class="product-remove"></td>
<td class="image-prod">
<div class="">
<asp:Image ID="Image1" CssClass=" img" ImageUrl='<%# "../img/" + Eval("picture")
%> ' runat="server" />
</div>
</td>
<td class="product-name"><%# Eval("namebook") %> </td>
<td class="price"><%# Eval("Price") %> </td>
<td class="quantity"><%# Eval("titel") %></td>
<td class="col-2">
<asp:Button ID="delete" CssClass="btn btn-outline-danger" CommandArgument='<%#
Eval("id")%>' OnClick="delete_Click" runat="server" Text="حذف کالا" />
</td>
<td>
<input id="quantity2" runat="server" type="number" value="1" min="1" max="20" />
</td>
</tr>
</ItemTemplate>
</asp:ListView>

You want a server control there. Additionally, this control only exists as part of an item template, meaning there isn't just one control named quantity2... there could be many, depending on the data source. Therefore referencing it just by name is not good enough. And speaking of data sources, depending on how you handle this the databinding may not have taken place yet at the time the Page_Load code runs, meaning the input control doesn't exist at all.
So the real question is: what do you want to do with this input?

CodeBehind="~/ (Page Name) .aspx.cs"

Cannot get inner HTML

I ran into the error: Cannot get inner content of ExportDiv because the contents are not literal I did a search and got this very useful resource!
I know I used server controls in my aspx page. The page fetches data dynamically from the database. How can I export this data to excel given that there're server controls in my html page.
Here're some of the site.aspx code to the page
<form id="form1" runat="server">
<div runat="server" id="ExportDiv">
<asp:Panel ID="ResultsPanel" runat="server">
<table cellpadding="0" class="style1">
<tr>
<td class="style2">
<asp:DetailsView ID="DetailsView1" runat="server" CellPadding="4"
</asp:DetailsView>
</td>
<td>
Poor</td>
<td>
Good</td>
<td class="style3">
Very Good</td>
<td>
Total Responses</td>
<td>
Average Score</td>
</tr>
<tr>
<td class="style2" colspan="6" bgcolor="#CCCCCC">
1. How would you rate the food served to you?</td>
</tr>
<tr>
<td class="style2">
a.) Overall Quality Taste and Flavour.<br />
b.) Variety of Food.</td>
<td>
<asp:Label ID="lblResult0" runat="server" Text="Label"></asp:Label><br/>
<asp:Label ID="lblResult3" runat="server" Text="Label"></asp:Label>
</td>
<td>
<asp:Label ID="lblResult1" runat="server" Text="Label"></asp:Label><br/>
<asp:Label ID="lblResult4" runat="server" Text="Label"></asp:Label>
</td>
<td class="style3">
<asp:Label ID="lblResult2" runat="server" Text="Label"></asp:Label><br/>
<asp:Label ID="lblResult5" runat="server" Text="Label"></asp:Label>
</td>
<td>
<asp:Label ID="aveNum0" runat="server" Text="Label"></asp:Label>
<br/>
<asp:Label ID="aveNum1" runat="server" Text="Label"></asp:Label>
<br/>
</td>
<td>
<asp:Label ID="aveScore0" runat="server" Text="Label" style="font-weight: 700"></asp:Label>
<br />
<asp:Label ID="aveScore1" runat="server" Text="Label" style="font-weight: 700"></asp:Label>
<br/>
</td>
</tr>
</table>
</asp:Panel>
</div>
<asp:GridView ID="gvSurveyResult" runat="server">
</asp:GridView>
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
</form>
</body>
And here's also the site.aspx.cs code
Response.AppendHeader("content-disposition", "attachment;filename=ExportedHtml.xls");
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.ms-excel";
this.EnableViewState = false;
Response.Write(ExportDiv.InnerHtml);
Response.End();
All answers would be welcomed!

It's been a while since I've done Server Controls, etc., but will this do the trick?
http://harouny.com/2012/10/15/render-asp-net-controls-user-controls-to-html-by-code/

I would suggest you to create a function that will convert your data into comma separated values and then render the same as CSV instead of excel format. Both CSV and excel format files would open the same way in excel.

ASP.NET Repeater Control Checkbox issue

Overview: Clicking on text of first CheckBox in a repeater control clicks the last one. I know why this is happening; association of label tag with element id chkMarkedForDeletion and when that label is clicked it selects the last CheckBox, as all the CheckBoxes have same ID.. damn you repeater control!! I am wondering if there is any way to avoid this? Easy way would be to create individual labels and associate correctly to each CheckBox but that defeats the supposed default behaviour of a CheckBox.
Repeater code:
<asp:Repeater ID="childNodesDataRepeater" runat="server">
<ItemTemplate>
<table style="width: 100%;" cellpadding="0" cellspacing="0" border="0">
<tr>
<td style="width: 200px;">
<asp:CheckBox ID="chkMarkedForDeletion" runat="server" EnableViewState="true" Text="Remove"
Checked='<%# DataBinder.Eval(Container.DataItem, "IsMarkedForDeletion") %>' />
</td>
<td>
</td>
<td style="width: 200px;">
<asp:CheckBox ID="chkHighImpactCause" runat="server" EnableViewState="true" Text="High Impact Cause"
Checked='<%# DataBinder.Eval(Container.DataItem, "IsHighPriority") %>' />
</td>
</tr>
<tr>
<td colspan="3">
<asp:Label ID="header002" runat="server" Text="What caused this problem?" />
</td>
</tr>
<tr>
<td colspan="3">
<asp:TextBox ID="txtProblemCausedBy" runat="server" EnableViewState="true" Width="100%"
Text='<%# DataBinder.Eval(Container.DataItem, "Description") %>' /><br />
</td>
</tr>
<tr>
<td colspan="3" style="height: 5px;">
<hr />
<asp:HiddenField ID="nodeIdentifier" runat="server" EnableViewState="true" Value='<%# DataBinder.Eval(Container.DataItem, "AnalysisID") %>' />
</td>
</tr>
</table>
</ItemTemplate>
</asp:Repeater>
Generated HTML Code for CheckBox:
<INPUT id=chkMarkedForDeletion type=checkbox name=TabContainer$tabProblemResolution$frmProblemResolution1$childNodesDataRepeater$ctl00$chkMarkedForDeletion>
<LABEL for=chkMarkedForDeletion>Remove</LABEL>
...
...
<INPUT id=chkMarkedForDeletion type=checkbox name=TabContainer$tabProblemResolution$frmProblemResolution1$childNodesDataRepeater$ctl02$chkMarkedForDeletion>
<LABEL for=chkMarkedForDeletion>Remove</LABEL>
Issue:
Thanks,
Abhi

Make sure the ClientIDMode on the repeater is not set to "Static".
This setting is inheritable from the parent, which goes all the way up to web.config. So if you have to set the ClientIDMode explicitly on the repeater, it means that some parent overrides the default (Predictable) to "Static".

asp.net dropdown postback not working on firefox

I am using dropdownlist placed inside ajax tab container.but it doesnt postback even though i have set autopostback property to true.This happens only in firefox and not in IE or chrome.Can any body help me regarding this.I am using ajax toolkit version 4.1.50731.0.
<asp:TabContainer ID="TabContainer2" runat="server" Width="100%" CssClass="myTab"
Height="2200px" ActiveTabIndex="0">
<asp:TabPanel ID="TabPanel8" runat="server" HeaderText="Add Transaction">
<ContentTemplate>
<div>
<table class="style1">
<tr>
<td class="style16">
</td>
<td align="right" class="style15">
Select News Heading :  
</td>
<td>
<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
AutoPostBack="True" >
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator12" runat="server" ControlToValidate="DropDownList1"
ErrorMessage="Please Select News Heading" ValidationGroup="a" InitialValue="Select News Heading">*</asp:RequiredFieldValidator><asp:ValidatorCalloutExtender
ID="RequiredFieldValidator12_ValidatorCalloutExtender" runat="server" Enabled="True"
TargetControlID="RequiredFieldValidator12">
</asp:ValidatorCalloutExtender>
<asp:Label ID="Label3" runat="server"></asp:Label>
</td>
<td>
  
</td>
</tr>
<tr>
<td class="style16">
  
</td>
<td align="right" class="style15">
  
</td>
<td>
  
</td>
<td>
  
</td>
</tr>
<tr>
<td class="style16">
 
</td>
<td align="right" class="style15">
Select Sub Heading : 
</td>
<td>
<asp:DropDownList ID="DropDownList2" runat="server" OnLoad="DropDownList2_Load">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator14" runat="server" ControlToValidate="DropDownList2"
ErrorMessage="Please select sub heading" ValidationGroup="a" InitialValue="Select News Name">*</asp:RequiredFieldValidator><asp:ValidatorCalloutExtender
ID="RequiredFieldValidator14_ValidatorCalloutExtender" runat="server" Enabled="True"
TargetControlID="RequiredFieldValidator14">
</asp:ValidatorCalloutExtender>
<asp:Label ID="Label4" runat="server"></asp:Label>
</td>
<td>
 
</td>
</tr>
</ContentTemplate>
</asp:TabPanel>
</asp:TabContainer>

you do appear to be missing a closing </table> and </div> tag from your content template.
does adding those fix your problem?
edit
Does your javascript console (e.g. firebug in firefox) give you any javascript errors?

Solution to your problem that I assume is:
If validation is failing then DropDownList won't PostBack, so please try once by disabling the Validators on DropDownList.
Some points to note
RequiredFieldValidator should have Display="None" as you are using ValidatorCalloutExtender
Put CausesValidation on the DropDownList and RequiredFieldValidator
It would result in auto triggering the validation on server-side.
Check the Page.IsValid in the SelectedIndexChanged event handler before proceeding any other code parts.

Read textbox from ASP.net page that repeated n times

I have an asp.net web page that's has a number of controls that are repeated according to number of records retrieved from the database, and I wanna read the values of those text boxes after users enter values in them, so please if anyone can help me on this issue.
I have an example of my work
<% System.Data.SqlClient.SqlDataReader myDReader = myDatabaseConnector.getDataFromDBAsSQLDataReader("SELECT * from students);
while(myDReader.Read())
{ %>
<asp:TextBox ID="txtCourseInfo" Test="" EnableViewState="false" CssClass="dataEntrySearchDataText" ReadOnly="true" runat="server"></asp:TextBox>
<% } %>
This a sample of what I have mean from my question in which I want to retrieve the value of txtCourseInfo in my C# code behind

You could use a Repeater to do this:
<asp:repeater id="rptCourses" runat="server" DataSourceID="dsCourseInfo"
<ItemTemplate>
<asp:TextBox ID="txtCourseInfo" Text='<%#Eval("StudentName")#%>' EnableViewState="false" CssClass="dataEntrySearchDataText" ReadOnly="true" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:Repeater>
<asp:sqldatasource id="dsCourseInfo"
ConnectionString="<%$ ConnectionStrings:YourConnectionString %>"
Select Command="Select * from Students">
</asp:sqldatasource>
That's all you need. from code behind you can iterate through the controls on the repeater and grab the information.
Notice the Eval expression on the text field. I used "StudentName" as an example, but you should use one of the column names returned by the select statement
Additional comments:
Don't do select * from ... It's a bad practice in many respects. Always specify the columns you need, even if you need all.
I realize that you disable viewstate on the textbox. I don't know the reason for doing this but be aware that the info won't be persisted on subsequent postbacks unless you enable it on the control.
UPDATE
Yes, you can have tables inside repeaters. Look at the example below:
<ItemTemplate>
<table runat="server" style="color: White; background-color: #3A4F63;" visible="false"
id="headerTable">
<tr>
<td colspan="3" align="center">
<asp:Label ID="headerTitle" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td style="width: 200px; background-color: #3A4F63; color: White;">
Image
</td>
<td style="width: 200px;">
Studen Name
</td>
<td style="width: 200px;">
Birth Date
</td>
</tr>
</table>
<table>
<tr>
<td style="width: 200px;">
<asp:Image ID="img" runat="server" ImageUrl='<%#Eval("ImageUrl") %>'></asp:Image>
</td>
<td style="width: 200px;">
<asp:Label ID="lblName" runat="server" Text='<%#Eval("Name") %>'></asp:Label>
</td>
<td style="width: 200px;">
<asp:Label ID="lblBirthDate" runat="server" Text='<%#Eval("BirthDate") %>'></asp:Label>
</td>
</tr>
</table>
</ItemTemplate>