title: Combobox in Asp.net issue
body: <p>I am using EntityFramework and i have an entity which is Customer.A customer could have other customers as References.P.k is CustomerID.
  On the Page i have a FormView which contains Name,CustomerID,... and one Field which is reference is Combobox which is bound to CustomerReference Entity which has MasterCustomerID(CustomerID) and ReferenceCustomerID  .A customer could have Multiple references.
  I want it displays the combobox with multiple selected Customers and also on the time of saving i will be able to save it CustomerReference entity.</p>
  
  <pre><code>&lt;asp:DropDownList runat="server" ID="dd" DataSourceID="ProjectForDropDownDataSource" DataTextField="...." DataValueField="..." SelectedValue='....%&gt;'&gt;&lt;/asp:DropDownList&gt;
  </code></pre>
  
  <p>Whats the Approach plz.
  thx</p>