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I am building a WCF based service application in .Net. I am currently designing the contracts.
Should I use response codes, exceptions or textual messages for my service responses to report service result status?
They will be consumed by web applications and other systems.
You should take a look at FaultContracts. See http://msdn.microsoft.com/en-us/library/system.servicemodel.faultcontractattribute.aspx
Your Fault Contract can include a (string based) error code for client side processing, and / or a textual message for display to users.
If your service, or rather you as a service designer, don’t know what a (future) client application will want to do with an error message (display or process), include both.