<script type="text/javascript">
 
    function SelectAll(id)
     {
        var frm = document.forms[0];
 
        for (i=0;i<frm.elements.length;i++)
         {
            if (frm.elements[i].type == "checkbox")
             {
                frm.elements[i].checked = document.getElementById(id).checked;
            }
        }
    }
</script>

 Protected Sub grdDeletedADs_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grdDeletedADs.RowDataBound
        Try
            If (e.Row.RowType = DataControlRowType.Header) Then
                DirectCast(e.Row.FindControl("chkAllRows"), CheckBox).Attributes.Add("onclick", "javascript:SelectAll('" & _
     DirectCast(e.Row.FindControl("chkAllRows"), CheckBox).ClientID & "')")
 
            End If
        Catch ex As Exception
            lblerror.Text=ex.Message
        End Try
    End Sub