Question

I have two namespaces with same name. Can I refer both in same file?

Answer 1

Yes, you can use an alias. See How to: Use the Namespace Alias Qualifier

Two relevant pats:

global::System.Console.WriteLine(number);

This will always work, even if you have other System or Console names.

using colAlias = System.Collections;

This lets you declare an alias for a given namespace.