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using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace myControls
{
  public class HelloWorld : WebControl
  {
    protected override void RenderContents(HtmlTextWriter writer)
    {
      writer.Write("Hello World");
    }
  }
}
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<%@ Register TagPrefix="custom" Namespace="myControls" %>
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<pages>
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  </controls>
</pages>    
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