<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentMain" runat="Server">
    <section class="section-admin-main">
        <h1 class="page-title">
            <asp:Label ID="lblTitle" runat="server" Text="Informes"></asp:Label>
        </h1>
        <telerik:RadAjaxManagerProxy ID="RadAjaxManager1" runat="server">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="rcb_Views">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="rcb_Views"></telerik:AjaxUpdatedControl>
                        <telerik:AjaxUpdatedControl ControlID="RG_DistributorsWithoutParts"></telerik:AjaxUpdatedControl>
                        <telerik:AjaxUpdatedControl ControlID="eds_Generic"></telerik:AjaxUpdatedControl>
                    </UpdatedControls>
                </telerik:AjaxSetting>
                <telerik:AjaxSetting AjaxControlID="RG_DistributorsWithoutParts">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="rcb_Views"></telerik:AjaxUpdatedControl>
                        <telerik:AjaxUpdatedControl ControlID="RG_DistributorsWithoutParts"></telerik:AjaxUpdatedControl>
                        <telerik:AjaxUpdatedControl ControlID="eds_Generic"></telerik:AjaxUpdatedControl>
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
        </telerik:RadAjaxManagerProxy>
        <div id="div_combo">
            <telerik:RadComboBox ID="rcb_Views" runat="server" MaxHeight="200" Width="315" OnSelectedIndexChanged="rcb_Views_SelectedIndexChanged" DataSourceID="eds_ViewNames"
                DataTextField="description" DataValueField="ViewName" AutoPostBack="true" Label="Seleccione los datos a mostrar: ">
            </telerik:RadComboBox>
        </div>
        <telerik:RadGrid ID="RG_DistributorsWithoutParts" runat="server" Height="500px" AllowPaging="True" ShowFooter="True"
            AllowSorting="True" AutoGenerateColumns="True" ShowStatusBar="True" AllowFilteringByColumn="True" DataSourceID="eds_Generic" 
            OnItemCommand="RG_DistributorsWithoutParts_ItemCommand" CellSpacing="-1" Culture="es-ES" GridLines="Both">
            <GroupingSettings CaseSensitive="false" />
            <MasterTableView Width="100%" CommandItemDisplay="Top" CommandItemSettings-ShowAddNewRecordButton="false" CommandItemSettings-ShowRefreshButton="true" CommandItemSettings-ShowExportToExcelButton="true" PageSize="50">
                <CommandItemSettings ShowAddNewRecordButton="False" ShowExportToExcelButton="True"></CommandItemSettings>
                <Columns>
                </Columns>
            </MasterTableView>
            <ClientSettings>
                <Scrolling AllowScroll="true" UseStaticHeaders="false" SaveScrollPosition="false" />
                <Resizing AllowColumnResize="true" AllowResizeToFit="true" />
            </ClientSettings>
        </telerik:RadGrid>
        <asp:SqlDataSource ID="eds_Generic" runat="server" ConnectionString="<%$ ConnectionStrings:LMSViewsConnString %>" SelectCommand="SELECT * FROM [man_participantes]"></asp:SqlDataSource>
        <asp:SqlDataSource ID="eds_ViewNames" runat="server" ConnectionString="<%$ ConnectionStrings:LMSViewsConnString %>" SelectCommand="SELECT * FROM [v_ViewNames]"></asp:SqlDataSource>
    </section>
</asp:Content>
<asp:Content ID="Content4" ContentPlaceHolderID="FooterScripts" runat="Server">
    <style type="text/css">
        input[type="checkbox"] {
            -webkit-appearance: checkbox;
        }

        input[type="radio"] {
            -webkit-appearance: radio;
        }
    </style>

    <script type="text/javascript">
        function pageLoad() {
            var grid = $find('<%=RG_DistributorsWithoutParts.ClientID %>');
            var columns = grid.get_masterTableView().get_columns();
                for (var i = 0; i < columns.length; i++) {
                    columns[i].resizeToFit();
                }
        }
    </script>
</asp:Content>

protected void Page_Load(object sender, EventArgs e)
{
    (this.Master as BaseMaster).setVisibilityMenu(false);
    this.meth_TranslateGrids(RG_DistributorsWithoutParts);
    if (rcb_Views.SelectedValue != "")
    {
        eds_Generic.SelectCommand = "SELECT * FROM [" + rcb_Views.SelectedValue + "]";
    }

    if (!IsPostBack)
    {
        rcb_Views.DataBind();
        eds_Generic.SelectCommand = "SELECT * FROM [" + rcb_Views.SelectedValue + "]";
        RG_DistributorsWithoutParts.DataBind();
    }
}
protected void rcb_Views_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
{
    eds_Generic.SelectCommand = "SELECT * FROM [" + rcb_Views.SelectedValue + "]";
    RG_DistributorsWithoutParts.DataBind();
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <telerik:RadStyleSheetManager id="RadStyleSheetManager1" runat="server" />
</head>
<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        <Scripts>
            <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />
            <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />
            <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />
        </Scripts>
    </telerik:RadScriptManager>
    <div>
        <telerik:RadGrid ID="GridFile" runat="server"         
            OnNeedDataSource="ContextGrid_NeedDataSource"
            AllowSorting="true"
            AllowFilteringByColumn="True"
            FilterType="HeaderContext"
            EnableHeaderContextMenu="true" 
            EnableHeaderContextFilterMenu="true"
            OnFilterCheckListItemsRequested="RadGrid1_FilterCheckListItemsRequested"  
            FilterMenu-EnableRoundedCorners="false"
            >
             <MasterTableView AutoGenerateColumns="false" TableLayout="Auto"> 
                <Columns>
                    <telerik:GridBoundColumn UniqueName="Creation" DataField="Creation" HeaderText="Creation"   FilterCheckListEnableLoadOnDemand="true"/>
                    <telerik:GridBoundColumn UniqueName="Name" DataField="Name" HeaderText="Name" FilterCheckListEnableLoadOnDemand="true"/>
                 </Columns>
            </MasterTableView>
        </telerik:RadGrid>
    </div>
    </form>
</body>
</html>

using System.Data;
using Telerik.Web.UI;


public partial class Default : System.Web.UI.Page 
{
    
    protected void ContextGrid_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
    {
        DataTable table = new DataTable();

        GridFile.DataSource = getTable();
    }


    protected void RadGrid1_FilterCheckListItemsRequested(object sender, GridFilterCheckListItemsRequestedEventArgs e)
    {
        string DataField = (e.Column as IGridDataColumn).GetActiveDataField();
        DataTable table = getTable();

        table.DefaultView.Sort = DataField + " asc";

        e.ListBox.DataSource = table.DefaultView.ToTable(true, DataField);
        e.ListBox.DataKeyField = DataField;
        e.ListBox.DataTextField = DataField;
        e.ListBox.DataValueField = DataField;
        e.ListBox.DataBind();
    }

    protected DataTable getTable()
    {
        DataTable table = new DataTable();
        table.Columns.Add("Creation", typeof(string));
        table.Columns.Add("Name", typeof(string));

        int i = 0;
        for (i=0; i < 10; i++)
        {

            table.Rows.Add(
                "Name " + i,
                i + " The AND a test"
                ) ;
        }
        return table;
    }

}