What is the difference between static methods in a Non static class and static methods in a static class?

Question

I have two classes Class A and ClassB:

static class ClassA {     static string SomeMethod()     {         return "I am a Static Method";     } }  class ClassB {     static string SomeMethod()     {         return "I am a Static Method";     } } 

I want to know what is the difference between ClassA.SomeMethod(); and ClassB.SomeMethod();

When they both can be accessed without creating an instance of the class, why do we need to create a static class instead of just using a non static class and declaring the methods as static?

Answer 1

The only difference is that static methods in a nonstatic class cannot be extension methods.

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In other words, this is invalid:

class Test {     static void getCount(this ICollection<int> collection)     { return collection.Count; } } 

whereas this is valid:

static class Test {     static void getCount(this ICollection<int> collection)     { return collection.Count; } }