Your official information source from the .NET Web Development and Tools group at Microsoft.
OWIN Startup class is the entry point for any OWIN based application. When you use VS 2013 to create web projects, a Startup class is created for you by VS.
Check out how Katana runtime does the OWIN Startup class detection and learn how you can create an application with multiple Startup configuration classes suitable for different environments.
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i want a solution for vs 2012 or vs 2010.
The OWIN Startup detection logic work the same way on VS 2012 (.net 4.5 & .net 4.0) and VS 2010 (.net 4.0) as well. You will just miss the tooling there.