title: Must declare a body because it is not marked abstract or extern (CS0501)
body: <p>Im newbie in C# and don't know its syntax. But I know a bit about other languages (Java, C++).
  I downloaded <a href="http://sourceforge.net/projects/glwidget/files/" rel="nofollow">GLWidget project</a> and tryed to build it. However I got an error CS0501 at these lines (with <code>{ get; set; }</code>):</p>
  
  <pre><code>namespace Gtk
  {
      [ToolboxItem(true)]
      public class GLWidget : DrawingArea, IDisposable
      {
          IGraphicsContext graphicsContext;
          static int graphicsContextCount;
  
          /// &lt;summary&gt;Use a single buffer versus a double buffer.&lt;/summary&gt;
          [Browsable(true)]
          public bool SingleBuffer { get; set; }
  
          /// &lt;summary&gt;Color Buffer Bits-Per-Pixel&lt;/summary&gt;
          public int ColorBPP { get; set; }
  
          /// &lt;summary&gt;Accumulation Buffer Bits-Per-Pixel&lt;/summary&gt;
          public int AccumulatorBPP { get; set; }
  
          /// &lt;summary&gt;Depth Buffer Bits-Per-Pixel&lt;/summary&gt;
          public int DepthBPP { get; set; }
  
          /// &lt;summary&gt;Stencil Buffer Bits-Per-Pixel&lt;/summary&gt;
          public int StencilBPP { get; set; }
  
          /// &lt;summary&gt;Number of samples&lt;/summary&gt;
          public int Samples { get; set; }
  
          /// &lt;summary&gt;Indicates if steropic renderering is enabled&lt;/summary&gt;
          public bool Stereo { get; set; }
  
          IWindowInfo windowInfo;
  </code></pre>
  
  <p>Why did this guy do that? Is it a trivial error or not?</p>