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The problem is that the diagram does not know how to deserialize the extra information in the file. You can solve this by telling it which class is responsible for deserializing this information. 1. Make sure you are using some appropriate namespaces using System.Runtime.Serialization; using Crainiate...

Shapes are fully serializable by themselves, this is how the cut and paste system and the undo/redo system works. You can use normal .net serialization using a binary, soap or xml formatter to copy these items to eg a stream (say with a right click context menu option), then deserialize them as normal...