<telerik:RadGrid AllowSorting="true" ID="RadGrid1" runat="server" AllowPaging="True" Width="800" OnNeedDataSource="RadGrid1_NeedDataSource"
PageSize="3" AutoGenerateDeleteColumn="true">
<MasterTableView AutoGenerateColumns="true" DataKeyNames="ID" EditMode="Batch" CommandItemDisplay="Top">
    <BatchEditingSettings HighlightDeletedRows="true" />
</MasterTableView>
</telerik:RadGrid>

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    (sender as RadGrid).DataSource = Enumerable.Range(1, 20).Select(x => new Item{ ID = x, Name = "Name " + x });
}

public class Item
{
    public int ID { get; set; }
    public string Name { get; set; }
}