visual studio - Keep common functions in separate cs file? (C#) -

i have common functions apppath() used in several windows forms of application, instead of declaring in each form, place in separate cs file.

i have created separate class cs file, gave different namespace (modutilities) , put functions inside modutilities class.

namespace modutilities {     public class modutilities     {         // functions such apppath()....     } } 

but can't figure out how use function modutilities inside different windows forms need it. trying use "using modutilities", instead of creating new instance (modutilities modu = new modutilities()) can me?

if methods static within class, can do

using modutilities; 

then

var = modutilities.apppath(); 

if not, you'll need create instance of class.

modutilities mod = new modutilities();