How can you Write Android Application using C# language?

Check MonoDroid IDE , you can write android application with C# syntax

Firstly MonoDroid is a great tool for developing Android Application and not a secret that the Performance testing for the C# Android application Gives a good  indicators than Java typed App this was the good news ..the bad news is the Personal/Free Editions supply a very limited options and tools So if you decided to use the MonoDroid  for a commercial use it will be Great decision to buy the full version .