best browser to use while testing asp.net web application

There is nothing called best browser for testing.

 

You need to design your application such a way that it should work in all browsers. You need to test the same application in all type browser which are your client is going to use.

 

Go through below links:

 

http://techbrij.com/7-tips-to-make-your-website-cross-browser-compatible 

 

http://www.codeproject.com/Questions/143600/How-do-i-make-my-Website-cross-Browser-compatible

 

http://www.sitepoint.com/understanding-responsive-web-design-cross-browser-compatibility/