title: Knockout dropdown binding and returning value
body: <p>I am binding select list in knockout </p>
  
  <p>Html:     </p>
  
  <pre><code>&lt;select data-bind="options: $parent.Languages, optionsValue:function(item) { return item.Value; }, optionsText: function(item) {return item.Text; }, value: LanguageID, valueUpdate: 'change'" /&gt;
  </code></pre>
  
  <p>on submit ==>
  var data = ko.mapping.toJS(viewModel1);</p>
  
  <p>Controller:</p>
  
  <pre><code>Languages = new SelectList(this.Languages(), "ID", "LanguageName", SelectedLanguageID);
  </code></pre>
  
  <p>It returns the complete object in 
  LanguageID = "Selected: true, ID: 1, LanguageName: "English" 
  but i want that it should return only ID like LanguageID = 1</p>
  
  <p>I already use subscribe method and assign</p>