Hi Kalpesh,
I have over 7 years of experience with .NET, mainly C# and just a bit of managed C++. I'm trying to start some how here, so I'm counting on you :)
I'm experienced in TDD approach, so writing tests for existing code is just a matter of understanding what it does. I prefer to use nUnit, however, I'm also familiar with MSTest framework. Not sure how complex data should feed the tests methods, in this case we can use SpecFlow to make it easy.
There is one thing, which I'm sure you are aware of, that sometimes to cover code by unit test, the code itself requires refactoring.
If you could just let me know a brief number of classes to test and the target percentage of code coverage you require.
If you have any questions just contact me. I can send a CV and list of the projects descriptions I worked on.
Cheers
Pawel