Default Message
Default Message property of the RadDropDownList enables the ability to set control's text if no item is selected. The Default Message property could be very useful, when one needs to provide more information about the content of the RadDropDownList. This text is not visible when the control gets the focus and appears again on blur if no item is selected.
Setting the Default Message in the markup code
<telerik:RadDropDownList RenderMode="Lightweight" ID="RadDropDownList1"
runat="server"
AutoPostBack="true"
DefaultMessage="Select an item">
</telerik:RadDropDownList>
Setting the Default Message server-side
protected void Page_Load(object sender, EventArgs e)
{
RadDropDownList1.DefaultMessage = "Select an item";
}
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
RadDropDownList1.DefaultMessage = "Select an item"
End Sub
Setting the Default Message client-side
var dropdownlist = $find("<%= RadDropDownList1.ClientID %>");
dropdownlist.set_defaultMessage("Select an item");
Additionally, you can get the Default Message property client-side by calling the get_defaultMessage() method of the dropdownlist.