Double class problem

[C# Programming]

hi,
Lets say i have a class named 'MyClass'. This class contains a field, 'Key', that behaves like a PK for all of the class instances, means that only one instance can have the value X for this 'Key' field.

Now i need to serialize this class and transfer it, but if the other side already has a 'MyClass' instance with the same 'Key' value i get two instances contains the same 'Key' field value... Problem.

ideas?

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