title: Open and closing from different project under same solution for c#.net
body: <p>I have 2 projects here under the same solution for C#.net
  Let's called it project1 and project2. I have project1 been open. 
  When I click on a button on project1, it will go then to project2.</p>
  
  <pre><code>//using this code
  var project2= new project2();
  project2.Show();
  this.Hide();
  </code></pre>
  
  <p>But I still did not manage to do it. Can anybody suggest what should I do?</p>