Mandatory selection for dropdown list in MVC 2

I have a strongly typed view populated from viewmodel that has dropdown list.

 <%= Html.DropDownList("ID", Model.custList, "--select--")%>
  <%= Html.ValidationMessage("ID")%>

Which passes id to controller

public ActionResult Submit((int? ID)

I want to make dropdown mandatory so user must select an option
<%= Html.DropDownList("ID", Model.customereList, "--select--")%>

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Carl TawnSenior Systems and Integration DeveloperCommented:
If it's mandatory you could just take out the "--select--" option and default to the first option in the list instead.
ToString1Author Commented:

No I need the select option as this is a request from the client
Richard LeeSoftware EnthusiastCommented:
Perform validation on the drop down list


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