Элементы-потребители данных ASP .NET 2.0

<asp:GridView ID="GridView1" runat="server" 
    AutoGenerateColumns="False" DataKeyNames="UID"
    DataSourceID="SqlDataSource1" 
    EmptyDataText="There are no data records to display.">
    <Columns>
        <asp:BoundField DataField="name" HeaderText="name" 
SortExpression="name" />
        <asp:BoundField DataField="Comments" 
HeaderText="Comments" SortExpression="Comments" />
    </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:DemoBaseConnectionString1 %>"
        DeleteCommand="DELETE FROM [Users] WHERE [UID] = @UID" 
InsertCommand="INSERT INTO [Users] ([UID], [name], [Comments]) 
VALUES (@UID, @name, @Comments)"
        ProviderName="<%$ 
ConnectionStrings:DemoBaseConnectionString1.ProviderName %>"
    SelectCommand="SELECT [UID], [name], [Comments] FROM [Users]" 
UpdateCommand="UPDATE [Users] SET [name] = @name, [Comments] = 
@Comments WHERE [UID] = @UID">
    <InsertParameters>
        <asp:Parameter Name="UID" Type="Int32" />
        <asp:Parameter Name="name" Type="String" />
        <asp:Parameter Name="Comments" Type="String" />
    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Name="name" Type="String" />
        <asp:Parameter Name="Comments" Type="String" />
        <asp:Parameter Name="UID" Type="Int32" />
    </UpdateParameters>
    <DeleteParameters>
        <asp:Parameter Name="UID" Type="Int32" />
    </DeleteParameters>
</asp:SqlDataSource>

protected void GridView1_Sorting(object sender, 
GridViewSortEventArgs e)
{
    string oldExpression = GridView1.SortExpression;
    string newExpression = e.SortExpression;
    if (oldExpression.IndexOf(newExpression) < 0)
    {
        if (oldExpression.Length > 0)
             e.SortExpression = oldExpression + ", " + 
newExpression;
         else
             e.SortExpression = newExpression;
     }
     else
     {
         e.SortExpression = oldExpression;
     }
}