Send Activity
Last changed: -80.126.16.139
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Summary
The SendActivity activity enables you to participate in a conversation with a WCF service using a predefined message exchange pattern.

Allows a workflow to call a WCF service directly.

Note
The SendActivity activity is a blocking activity, meaning that workflow execution will be blocked until the activity completes execution.

http://msdn2.microsoft.com/en-us/library/bb495759.aspx