This article shows how to select multiple items in radcombobox and to get these selected values at server side. Also it shows how to show selected value in radcombobox using javascript.
1.First of all declare radcombobox.
<telerik:RadComboBox ID="ddlVehicleOwners" OnClientSelectedIndexChanging="onSelectedIndexChangingVehicleOwner" runat="server" Skin="WebBlue" OnClientDropDownClosed="HandleClose" LoadingMessage="Loading..." >
<ItemTemplate>
<table...