Yes, as long as there are no Windows Forms objects saved in the files (e.g. ControlNodes or your own custom types deriving from WinForms classes).

I hope that helps,
Stoyan

If you use XML format, just copy your Serialize/DeserializeTag event handlers to the ASP.NET app. If using binary format and the tag type is defined in a dll file that will be used in the web project too, it should work out of the box.

There will be a problem if the tag type was defined in the .exe file. The type is identified by its full name (including assembly + namespace), so it will fail to load if you just copy the code to the web project. To work around that, set Diagram.SerializationBinder to an object whose BindToType instance returns the type from the web project that corresponds to the specified full name from the exe project:

public Type BindToType(
	string assemblyName,
	string typeName)
{
	if (assemblyName = "MyExeProject")
	{
		if (typeName == "MyExeNameSpace.MyType")
			return typeof(MyWebNameSpace.MyType);
		...
	}
	return null;
} 

I hope that helps,
Stoyan