A single check box to check/uncheck all checkbox in a datagrid view

[johnsonlim026]

Hi,
I am a new bee in ASP.NEt.
My coding is as below.I have a problem in checking whether the first checkbox is checked or unchecked and then check /unchecked all the other checkbox in the datagridview.

<script runat="server">

    Sub CheckAll_Click(sender As Object, e As EventArgs)
        Dim i As Integer
        
        For i = 0 To dgv1.Rows.Count - 1
            
            CType(dgv1.Rows(i).FindControl("chkAll"), CheckBox).Checked = True
        Next
        
        
    End Sub

</script>


 <HeaderTemplate>								
                            <asp:CheckBox id="chkAllq" runat="server" OnCheckedChanged="CheckAll_Click" >
                            </asp:CheckBox>							
                            </HeaderTemplate>

My problem is how to fire the CheckAll_Click event when the checkbox is checked or unchecked.Does any one has idea on this?what should i put in instead of OnCheckedChanged as does not fire the event ?

[ronmoles]

First of all, it looks like you are only setting all of the check boxes to true (don't have a way of setting them to false).

I'm not so good at VB, and you might need to make my code look more like VB, but I think your code needs to look like this:

Sub CheckAll_Click(sender As Object, e As EventArgs)
    Dim i As Integer
    Dim newValue As Bool
        
    // this will determine if that one "master" checkbox is checked or not
    // set a variable for either case
    if (chkAll.checked)
        newValue = true
    else
        newValue = false

    // now assign that variable to each of the other checkboxes
    For i = 0 To dgv1.Rows.Count - 1
        dgv1.Rows(i).Checked = newValue
    Next
              
End Sub

Is this what you are looking for?

[johnsonlim026]

Yes.Got it.Thanks!!