what possible in static class and not in non-static class C#

Question

what possible in a static class and not in non-static class or vice versa in C#, for example

 

 static class

 MyProgram.CallFunction();

 

non-static class 

MyProgram obj =new MyProgram();

obj.CallFunction();

 

in the above example without creating the instance we can able to call static class members so this is basic.

I'm looking for a difference which is possible and not possible in static and non-static