Question

I have a GridView with a Checkbox on the first column:

<asp:GridView ID="dgNumeradores" runat="server" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="ItemID">
    <Columns>
        <asp:TemplateField HeaderText="Seleccionar">
            <ItemTemplate>
                <asp:CheckBox runat="server" ID="chkChecked" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField HeaderText="Item" DataField="Description">
        </asp:BoundField>
        <asp:BoundField HeaderText="Plantilla" DataField="Template">
        </asp:BoundField>
    </Columns>
</asp:GridView>

Now in the code behind I try to update the Checked column on the DataTable acting as datasource for the GridView (since, as you can see above, the Checkbox column is not bound to the datasource for reasons you probably know.):

Protected Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
    Try
        For Each dr As GridViewRow In Me.dgNumeradores.Rows
            Me.itemsNumTable.Select("ItemID = '" & dgNumeradores.DataKeys(dr.RowIndex).Value & "'")(0)("Checked") = DirectCast(dr.Cells(0).FindControl("chkChecked"), CheckBox).Checked
        Next
        'Some more unimportant-for-this-question code
    Catch ex As Exception
        tableInfo.ShowError(ex.Message)
    End Try
End Sub

The thing is that the Checkbox.Checked always returns False.

How can I get the checked state of the Checkboxes in this scenario? Or what would be the best approach into updating the aforementioned column?

P.S. Note that click on the checkboxes doesn’t post back. Nothing happens on the page until the user clicks Save (and that is the intended behavior).

Answer 1

Are you binding the GridView in Page Load? If that is the case use IsPostBack

IF Not IsPostBack Then
   DataBind()
End IF