title: Change value of data inside databinding before displaying to textbox
body: <p>I have the same set up of databindings as this one
  <a href="https://stackoverflow.com/questions/22349162/visual-studio-winform-designer-set-databindings-on-current-control-bindingsourc">Visual Studio Winform designer: Set DataBindings on current control BindingSource</a></p>
  
  <p>But I don't know how to change the value of let's say I have 2 models:</p>
  
  <pre><code>class Receipt {
     public int ProductId { get; set; }
     public double Price { get; set; }
     //etc...
  }
  
  class Product {
     public int ProductId { get; set; }
     public string ProductName { get; set; }
     //etc...
  }
  </code></pre>
  
  <p>My datagrid shows the Receipt model and when one is selected, my textboxes shows other details which are not displayed in the datagrid.</p>
  
  <p>Now my problem is I need to display on my text box the ProductName instead of the ProductId.</p>
  
  <p>I am using Entity Framework Code First.
  Please help...</p>
  
  <p>TIA.</p>