Creating a Class in C#, which file should I use? -

as told in question before, i'm starting learn c# , right i'm beginning classes theory, when going create class found there 2 'templates' [i'm using xamarin on mac], 1 under c# -> general, , other 1 in c# -> monogame. both seems pretty same, want know 1 should use, or differences between both?

this 1 located in general:

using system;  namespace application {     public class stack     {         public stack ()         {         }     } } 

and 1 in monogame:

using system; using system.collections.generic; using system.linq; using system.text;  using microsoft.xna.framework; using microsoft.xna.framework.audio; using microsoft.xna.framework.gamerservices; using microsoft.xna.framework.graphics; using microsoft.xna.framework.input; using microsoft.xna.framework.input.touch; using microsoft.xna.framework.storage; using microsoft.xna.framework.content; using microsoft.xna.framework.media;  namespace application {     class stack     {      } } 

the using system basic framework needs uploaded thing console.write(). out it, you'd have system.console.write.

in second example, importing other framework might need depending on developing. looks of it, basic game framework set: audio, graphics, touch, etc.

the using way import frameworks might need. see: https://msdn.microsoft.com/en-us/library/zhdeatwt.aspx