The solution to the problem that the namespace cannot be found when calling the PanelDesigner class
Author：Eve Cole
Update Time：2009-06-30 16:32:54
Original address: http://www.dotnet247.com/247reference/msgs/41/205580.aspx
The PanelDesigner class is included in the System.Web.UI.Design namespace, but is defined in System.Design.dll. To use this class, you need to add a System.Design.dll reference.
Quote: System.Web.UI.Design.WebControls can call the PanelDesigner class
