C#

public class Utilities<br />
{<br />
   private static bool AppRunnning = false; <br />
   public static void Main(string[] args)<br />
   {<br />
      AppRunnning = true;<br />
      Application.Run(new Form1());<br />
   }<br />
   public static bool InDesignMode<br />
   {<br />
      get { return !AppRunnning; }<br />
   }<br />
}<br />
<br />
public class MyControl:UserControl<br />
{<br />
   public MyControl()<br />
   {<br />
      if (Utilities.InDesignMode)<br />
      {<br />
          //your code<br />
      }<br />
      else<br />
      {<br />
          //alternate code<br />
      }<br />
   }<br />
}