title: PictureBox always throws NullReferenceException
body: <p>A simple code that should show an image using PictureBox doesn't work (frm is my form):</p>
  
  <pre><code>PictureBox pb = new PictureBox();
  pb.Image = new Bitmap("1.jpg");
  pb.SizeMode = PictureBoxSizeMode.Zoom;
  frm.Controls.Add(pb);
  </code></pre>
  
  <p>When event with this code happens I have NullReferenceExcpetion</p>
  
  <p>The error occurs at <code>frm.Controls.Add(pb)</code></p>
  
  <p>The exception is: </p>
  
  <blockquote>
    <p>System.NullReferenceException: Object reference not set to an instance
    of an object. at Form1.HotKeyManager_HotKeyPressed(Object sender,
    HotKeyEventArgs e) in C:\Users\Алексей\Documents\Visual Studio
    2010\Projects\NotepadCSharpSetup\WinFormsAgain\RealTrayForm\Test.cs:line
    52</p>
  </blockquote>
  
  <p>Full code : </p>
  
  <pre><code>static void HotKeyManager_HotKeyPressed(object sender, HotKeyEventArgs e)
  {
      Size ScreenSize = Screen.PrimaryScreen.Bounds.Size;
  
      Bitmap image = new Bitmap(ScreenSize.Width, ScreenSize.Height);
      using (Graphics g = Graphics.FromImage(image))
      {
          g.CopyFromScreen(Point.Empty, Point.Empty, ScreenSize);
      }
      Bitmap preview = new Bitmap(image.Width / 10, image.Height / 10);
      using (Graphics gr = Graphics.FromImage(preview))
      {
          gr.SmoothingMode = SmoothingMode.AntiAlias;
          gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
          gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
          gr.DrawImage(image, new Rectangle(0, 0, image.Width / 10, image.Height / 10));
      }
      preview.Save("1.jpg");
  
      Form frm = (Form)sender;
      PictureBox pb = new PictureBox();
      pb.Image = new Bitmap("1.jpg");
      pb.SizeMode = PictureBoxSizeMode.Zoom;
      frm.Controls.Add(pb);
  
  }
  </code></pre>