Detecting Checked Checkboxes in DataGrid

[Sheffield]

Greetings,

I've been unable to determine which CheckBoxes are being 'checked' within a DataGrid. The following code iterates through the entire datagrid, but never identifies the checked checkboxes.

Sub OnCheckOut( s As Object, e As EventArgs )
  Dim i As Integer
  Dim blnIsChecked As Boolean    
         
  For i = 0 to dgrd_EmailUpdate.Items.Count - 1
    blnIsChecked = DirectCast(dgrd_EmailUpdate.Items(i).Cells(4).FindControl("chkSelected"), Web.UI.WebControls.CheckBox).Checked            
      If blnIsChecked = True Then
                response.write( i & " IS Checked <BR>")
                response.write("<BR>")                
      Else
                response.write( i & " IsNotChecked ")
                response.write("<BR>")
      End If            
  Next       
End Sub

Here is the datagrid I'm using as well as the button to kick things off.

<asp:DataGrid ID="dgrd_EmailUpdate"
	AutoGenerateColumns="False" Runat="Server">		<Columns>
     <asp:BoundColumn DataField="ID" HeaderText="ID" />
     <asp:BoundColumn DataField="EmailAddress" HeaderText="Email Address" />
     <asp:BoundColumn DataField="IPaddress" HeaderText="IPAddress" />
	<asp:BoundColumn DataField="datetime" HeaderText="DateTime"	HeaderStyle-Width="100" />
	<asp:TemplateColumn HeaderText="Remove"
	<ItemTemplate>
	     <TABLE>
		<TR>
		     <TD align="center">
			<asp:CheckBox id="chkSelected"  runat="server" />			
		     </TD>
		</TR>
         </TABLE>
	</ItemTemplate>
	</asp:TemplateColumn> 
	</Columns>			
</asp:DataGrid>						

<asp:Button Text="btnRemove" style="FONT:8pt Verdana; WIDTH: 100px" OnClick="OnCheckOut" RunAt="server" />

Clearly I'm missing something, but obviously I'm not bright enough to figure it out.

I greatly appreciate any help you can provide.

thanks

 

[cappmgr]

you could cast your control to a checkbox and test the the checked property.
never tried casting the value of a checkbox to a boolean

Sub OnCheckOut( s As Object, e As EventArgs )
  Dim i As DataGridItem
  For Each i In dgrd_EmailUpdate.Items
    Dim cb_Selected As CheckBox = CType(i.FindControl("chkSelected"), CheckBox)
      If cb_Selected.Checked Then
          response.write( i & " IS Checked <BR>")
          response.write("<BR>")                
      Else
          response.write( i & " IsNotChecked ")
          response.write("<BR>")
      End If            
  Next i       
End Sub

hth,
Marty

 

[BoulderBum]

In the debugger, does your code successfully find the CheckBox (though not its value)? Do you re-bind before checking values?

 

[Sheffield]

Yes, the checkbox is found. Turns out that both options above work perfectly. The only requirement (which I somehow overlooked multiple times) is that re-binding the datagrid NOT occur with each postback (duh!), so I had to include the binding in an "If NOT IsPostBack" condition within Page_Load().

Case closed!

Thanks