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Sample Download :  http://code.msdn.microsoft.com/Custom-WF4-Activity-b66a35e1

 When we trying to create a new Activity.we can also create our own validation rule. This sample demonstrates two different methods.
1. Basic Validation
  Basic Validation is usually created for validating the activity itself.
2. Relation Validation
  This type validation is usually created for validating the relation with other activities..

 

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