Kendo ui dropdownlist validation

<%= Html.Kendo().DropDownList()
    .Name("ScheduleNumber1")
    .DataTextField("ScheduleNumber")
    .DataValueField("ScheduleNumber")
    //  .Filter("contains")
    .DataSource(source => {
        source.Read(read =>
        {
            read.Action("GetScheduleNumber1", "Ticket");
        })
        .ServerFiltering(false);
    })
    .OptionLabel("Please Select")
%>

I am using kendo dropdownlist in my asp.net mvc problem can you tell me how to add required validation when Please select is selected i am not able to find how to add validation my model validation is not working