How can I disable a specific warning for a C# project in VS2012?

For the project level go to Project -> Properties -> Build tab

If you want to disable the warning to some code section, try this :

#pragma warning disable XXX,XXX
            //your code 
#pragma warning restore XXX,XXX

Read about #pragma warning

The warning you're getting has a number (e.g. CS2000), so what you need to do is right-click on the project, go to the Build tab, and add that warning to the Suppress warnings text box. You can subsequently suppress more than one by separating them with a comma (e.g. CS2000,CS2001).

You can open the project properties and enter comma separated warning numbers you want to suppress into the Suppress Warnings textbox on the Build tab.