net30 
namespace System.Web.UI.Design
{
    public abstract class WebFormsRootDesigner : IDesigner, IDesignerFilter, IRootDesigner, IDisposable
    {
        public virtual string GenerateErrorDesignTimeHtml(Control control, Exception e, string errorMessage);
    }
}
.NET Framework
2.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net30
Assembly

System.Design , Version=2.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs an assembly reference to System.Design.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API