How to remove unused using namespaces

Question

I am using visual studio 2010 and was wondering if there is a way to automatically remove all the namespaces that aren\'t being used at the the top of the page e.g.

Answer 1

I am using Visual Studio 2019 and for some reason my project settings have a Warning level of 3 and this prevent Visual Studio from cleaning the usings. Make sure this value is set to 4.