Hi Subbu,
First of all - thank you for your interest in Nevron Diagram.
A drawing document saved by the Diagram Designer can be loaded with the help of the NPersistencyManager extension. Check this topic for a complete discussion of document serialization:
Diagram for .NET > User's Guide > Extensions > Persistency Manager
Once loaded the drawing document can be simply assigned to the Document property of the ASP.NET NDrawingView control.
Best Regards,
Nevron Support Team