I checked Google App Engine and Heroku but both don't support .NET/C# applications. Even though Google App Engine shows support for Windows Azure, but in the supported languages it doesn't show C# or VB.
Is .NET not supported on Cloud Platform?
closed as unclear what you're asking by gnat, Kilian Foth, Doc Brown, GlenH7, MichaelT Feb 20 at 16:00
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To give specifics of the right kind of cloud (at time of writing):
For a Heroku like experience you might want to look at AppHarbor
And of course Windows Azure (-:
Beyond that anything that supports windows as a virtual machine - or not necessarily even that as a quick google will find you examples of deploying mono projects to Heroku...