title: Insert user into database via Entity Framework does not work
body: <p>I created a service-based database (<code>.mdf</code> file) in Visual Studio 2013 and then I wanted to use Entity Framework model designed from database. Select methods work fine but when I'm trying to do some inserts - they do not work, I'm not even getting errors.</p>
  
  <p>Code:</p>
  
  <pre><code>Database1Entities data = new Database1Entities();
  
  user player = new user();
  player.Nick = "halo halo";
  
  data.user.Add(player);
  
  data.SaveChanges();
  </code></pre>
  
  <p>and table definition</p>
  
  <p><img src="https://i.stack.imgur.com/JJ2qT.png" alt="enter image description here"></p>
  
  <p>I will be grateful for any help, thanks. </p>
  
  <p>Feel free to ask for more informations if needed</p>