title: use filter of bindingSource with Entity Framework
body: <p><strong>I working on a C# win-form app.</strong></p>
  
  <p>in my form i have Data-Grid-View that bind with a Binding-Source and Binding-Source Data-source is a table of entity-framework.</p>
  
  <p>when i use entity framework i cant use filter of the binding-source and the sort by columns of data-grid-view but when i don't use entity framework i can use them.
  how can i use them with entity-framework?</p>
  
  <p>my code when form loads is</p>
  
  <pre><code>contex = new myEntity();
  myBindingSource.DataSource = contex.myTable;
  </code></pre>