title: C# - Can't use the SystemParameters, "type or namespace does not exist"
body: <p>I use Visual Studio 2013 Professional, C#,
  I have got these usings and that line in my code.</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;               
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows.Forms;
  
  this.Width = System.Windows.SystemParameters.PrimaryScreenWidth;
  </code></pre>
  
  <p>However it has got an Error like "<strong>The type or namespace name 'SystemParameters' does not exist in the namespace 'System.Windows' (are you missing an assembly reference?)</strong>"</p>
  
  <p>I didnt really understand whats going on, should i add something more to use systemparamaters?</p>