[Sample of June 21st] Create a custom asynchronous code activity

Sample Download : https://code.msdn.microsoft.com/CSWF4AsyncHttpGetActivity-19559de8  

Today's sample is created for two purposes.

1. Demonstrate how to create an asynchronous WF4 activity and use it in workflow.
2. provide a usable Http Get Activity. so that you can use it directly in your project.

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