This class is used by the ASP.NET framework to parse .aspx files at design time. You do not use it in your code.

public sealed class DesignTimeParseData {
// Public Constructors
   public DesignTimeParseData(System.ComponentModel.Design.IDesignerHost designerHost, string parseText);
// Public Instance Properties
   public EventHandler DataBindingHandler{set; get; }
   public IDesignerHost DesignerHost{get; }
   public string DocumentUrl{set; get; }
   public string ParseText{get; }
}

Passed To

DesignTimeTemplateParser.{ParseControl( ), ParseTemplate( )}