title: String of point to PointCollection
body: <p>If I have a <a href="http://msdn.microsoft.com/en-us/library/system.windows.media.pointcollection%28v=vs.90%29.aspx" rel="nofollow"><code>PointCollection</code></a>:</p>
  
  <pre><code>var points = new PointCollection();
  points.Add(new Point(0, 0));
  points.Add(new Point(10, 10));
  points.Add(new Point(20, 20));
  points.Add(new Point(30, 30));
  </code></pre>
  
  <p>I can get the equivalent <code>string</code> using:</p>
  
  <pre><code>string str = points.ToString();
  </code></pre>
  
  <p>And now <code>str</code> is:</p>
  
  <blockquote>
    <p>0,0 10,10 20,20 30,30</p>
  </blockquote>
  
  <p>How can I get the reverse process?</p>