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Need a C# Web Service to call external Web Services. How?

Need a C# Web Service to call external Web Services. How?

I need to create a back-end web service which then calls a small handful of external web services in order to complete the calculations. Is this a simple task? Using C# to execute an external web service?

How would I call four different such calls at the same time? Does this qualify as "parallel processing"? Anything fancy needed? Or, can I quickly call one after the other, then get a callback for each?

How does this work?

Thanks
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Ryan Chong
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Which line of code is for the external call?
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So, the C# function will freeze there (on await) until a response comes? And this is why the function has a return value of "asynch"?

So, I would need four such calls, perhaps passing PostURL as an input parameter for req_AuthenticateUser (for example), so that I could potentially use just one function call?
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thanks