RadGrid for ASP.NET AJAX

When using server-side selection there will be no problems with viewstate disabled (see the Control state topic), however with client-side selection the selected item will be lost. The grid raises appropriate SelectedIndexChanged event with valid data as SelectedItems and SelectedIndexes.

To avoid such problems when the grid saves its settings in the control state (EnableViewState = false) and client-side selection we suggest you following workaround:

CopyC#

Telerik.Web.UI.GridItem item = null;

private void RadGrid1_SelectedIndexChanged(object sender, EventArgs e)
{
    item = RadGrid1.SelectedItems[0];
}

private void RadGrid1_PreRender(object sender, EventArgs e)
{
    if (item != null)
    {
        item.Selected = true;
    }
}

CopyVB.NET

Dim item As Telerik.Web.UI.GridItem = Nothing

Private Sub RadGrid1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    item = RadGrid1.SelectedItems(0)
End Sub

Private Sub RadGrid1_PreRender(ByVal sender As Object, ByVal e As EventArgs)
    If (Not (item) Is Nothing) Then
        item.Selected = True
    End If
End Sub

Where RadGrid1_PreRender is the event handler for RadGrid1.OnPreRender event and RadGrid1_SelectedIndexChanged is the event handler for RadGrid1.OnSelectedIndexChanged event.