title: Drawing on Form in C# using CreateGraphics()
body: <p>I'm trying to get drawing on C# Form working, but after reading documentation about Graphics class and Draw/Fill methods It still doesn't work for me.</p>
  
  <p>It's the code:</p>
  
  <pre><code>using System.Drawing;
  using System.Windows.Forms;
  
  namespace Drawing_Example
  {
      public partial class Form1 : Form
      {
          #region Constructors
  
          public Form1()
          {
              InitializeComponent();
  
              Pen pen = new Pen(Color.Black, 3f);
              Graphics surface = CreateGraphics();
              surface.DrawEllipse(pen, new Rectangle(0, 0, 200, 300));
  
              pen.Dispose();
              surface.Dispose();
          }
  
          #endregion Constructors
      }
  }
  </code></pre>
  
  <p>When I press Start an empty form appears, no drawings. Can you tell me what I'm doing wrong?</p>