Sorting a RadGrid with IEnumerable<T> and yield keyword

[Jason]

Why doesn't sorting work when you bind an IEnumerable<T> collection that uses the yield keyword?  Do I have to implement a custom paging solution?  I am using 2012 Q1 SP1 controls.

<telerik:RadGrid ID="RadGrid1" runat="server" OnNeedDataSource="RadGrid1_NeedDataSource">
    <MasterTableView AllowSorting="true" AllowPaging="true" PageSize="20" AllowFilteringByColumn="true" />
</telerik:RadGrid>

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.Linq;
using System.Linq;

using Telerik.Web.UI;

public class Class1
{
    public Class1(int i)
    {
        this.Column1 = i.ToString();
        this.Column2 = (200 - i).ToString();
        this.Column3 = System.Text.Encoding.Default.GetString(new[] { System.Convert.ToByte(65 + (i % 26)) });
    }

    public string Column1 { get; set; }
    public string Column2 { get; set; }
    public string Column3 { get; set; }

    public static IEnumerable<Class1> GetData()
    {
        List<Class1> data = new List<Class1>();

        for (int i = 0; i < 200; i++)
        {
            yield return new Class1(i);
        }
    }
}

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
    {
        //RadGrid1.DataSource = Class1.GetData().ToArray();  //works
        RadGrid1.DataSource = Class1.GetData();  //doesn't work
    }
}

[Tsvetina]

Hi Jason,

This problem has already been addressed in the latest internal build of RadControls. You can download it from your Telerik account and see if the grid now behaves as expected.

Greetings,
Tsvetina
the Telerik team