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    Grouping

    The demo shows how to apply group setting to the RadMultiColumnComboBox data source through the GroupByField property.
    • DefaultCS.aspx
    <%@ Page Language="c#" AutoEventWireup="true"  %>
     
    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <!DOCTYPE html>
    <html xmlns='http://www.w3.org/1999/xhtml'>
    <head runat="server">
        <title>Telerik ASP.NET Example</title>
    </head>
    <body>
        <form id="form1" runat="server">
        <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
        <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />
        <div class="demo-container size-thin" style="text-align: center">
            <telerik:RadMultiColumnComboBox ID="RadMultiColumnComboBox4" runat="server"
                GroupByField="Country" Filter="Contains"
                DropDownWidth="500" Height="400" Width="100%" Placeholder="select from the dropdown or type"
                DataTextField="ContactName" DataValueField="CustomerID" MinLength="3" EnforceMinLength="false">
                <WebServiceSettings Select-ContentType="JSON" ServiceType="OData"
                    Select-Url="https://demos.telerik.com/kendo-ui/service/Northwind.svc/Customers">
                </WebServiceSettings>
                <ColumnsCollection>
                    <telerik:MultiColumnComboBoxColumn Field="CustomerID" Title="ID" />
                    <telerik:MultiColumnComboBoxColumn Field="ContactName" Title="Name" />
                </ColumnsCollection>
            </telerik:RadMultiColumnComboBox>
        </div>
        </form>
    </body>
    </html>

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