Server-side Selecting with a CheckBox

You can use a template column to simulate the behavior of the GridClientSelectColumn, but handling the row selection server-side. Handling selection this way behaves like a grid with client-side selection, except that users cannot select rows by clicking on them.

To simulate the GridClientSelectColumn in a template column:

1. Create an ItemTemplate that contains a check box.

2. In the OnCheckedChanged event of the check box, set the parent row's Selected property to select or de-select the row.

3. If you are allowing multi-row selection, add a check box to the HeaderItemTemplate.

4. In the OnCheckChanged event of the header check box, set the Selected property of every row in the grid and the Checked property of the corresponding check boxes in the item templates.

The Parent property of the check box refers to the template. Therefore, to access the parent row, you must use the parent of the parent.

Note that in the grid declaration, you do not need to enable client-side selection:

      <telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" AllowPaging="True" PageSize="5" Skin="Silk"
        DataSourceID="SqlDataSource1" AllowMultiRowSelection="true">
        <MasterTableView>
          <Columns>
            <telerik:GridTemplateColumn UniqueName="CheckBoxTemplateColumn">
              <ItemTemplate>
                <asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="ToggleRowSelection"
                  AutoPostBack="True" />
              </ItemTemplate>
              <HeaderTemplate>
                <asp:CheckBox ID="headerChkbox" runat="server" OnCheckedChanged="ToggleSelectedState"
                  AutoPostBack="True" />
              </HeaderTemplate>
            </telerik:GridTemplateColumn>
          </Columns>
        </MasterTableView></telerik:RadGrid>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [Country] FROM [Customers]">
        </asp:SqlDataSource>

In the code-behind, the OnCheckedChanged event handlers (ToggleRowSelection and ToggleSelectedState) handle the selection and de-selection of rows:

        protected void ToggleRowSelection(object sender, EventArgs e)
        {
            ((sender as CheckBox).NamingContainer as GridItem).Selected = (sender as CheckBox).Checked;
            bool checkHeader = true;
            foreach (GridDataItem dataItem in RadGrid1.MasterTableView.Items)
            {
                if (!(dataItem.FindControl("CheckBox1") as CheckBox).Checked)
                {
                    checkHeader = false;
                    break;
                }
            }
            GridHeaderItem headerItem = RadGrid1.MasterTableView.GetItems(GridItemType.Header)[0] as GridHeaderItem;
            (headerItem.FindControl("headerChkbox") as CheckBox).Checked = checkHeader;
        }
        protected void ToggleSelectedState(object sender, EventArgs e)
        {
            CheckBox headerCheckBox = (sender as CheckBox);
            foreach (GridDataItem dataItem in RadGrid1.MasterTableView.Items)
            {
                (dataItem.FindControl("CheckBox1") as CheckBox).Checked = headerCheckBox.Checked;
                dataItem.Selected = headerCheckBox.Checked;
            }
        }

        Protected Sub ToggleRowSelection(ByVal sender As Object, ByVal e As EventArgs)

            TryCast(TryCast(sender, CheckBox).NamingContainer, GridItem).Selected = TryCast(sender, CheckBox).Checked
            Dim checkHeader As Boolean = True
            For Each dataItem As GridDataItem In RadGrid1.MasterTableView.Items
                If Not TryCast(dataItem.FindControl("CheckBox1"), CheckBox).Checked Then
                    checkHeader = False
                    Exit For
                End If
            Next
            Dim headerItem As GridHeaderItem = TryCast(RadGrid1.MasterTableView.GetItems(GridItemType.Header)(0), GridHeaderItem)
            TryCast(headerItem.FindControl("headerChkbox"), CheckBox).Checked = checkHeader
        End Sub
        Protected Sub ToggleSelectedState(ByVal sender As Object, ByVal e As EventArgs)
            Dim headerCheckBox As CheckBox = TryCast(sender, CheckBox)
            For Each dataItem As GridDataItem In RadGrid1.MasterTableView.Items
                TryCast(dataItem.FindControl("CheckBox1"), CheckBox).Checked = headerCheckBox.Checked
                dataItem.Selected = headerCheckBox.Checked
            Next
        End Sub

For a live example showing server-side selection, see Server-side row selection.