Using Statements vs Namespace path? C#

Question

I recently stopped using using-statements and instead use the full namespace path of any .net object that I call.

Example:

using System;    

namespa         


        

Answer 1

I think that this style result in a programmer performance decrease :). I use the using statement and usually it is clear from code to which namespace the class belong. If not, press F12.
Just my 2c.