why we can use static method in c#

[srinu sanaka]

what is static method?
why we can use static method inc#?

[zenzai]

In short:

"A static field is one whose value is shared by all instances of a class; its value conceptually belongs to the class as a whole instead of belonging to any one instance/object of that class....Just as static fields/properties are associated with a class as a whole versus relating to a specific individual object, static methods are in turn methods that can be invoked on a class as a whole. Static methods are useful for implementing general-purpose functionality— mathematical evaluations, for example—that can be used by any number of classes."

Quote from "Beginning C# 2008 Objects - From Concept to Code", one of the best books (if not THE best) you can get about OOP in C#.

http://www.apress.com/9781430210887

[Joseph Martell]

To add to zenzai's excellent response:

A static method is one that belongs to a class, but not an instance of that class. In other words, it can be called without having to have to reference an instance of a class. There are too many reasons that this is important/useful to list here, but one of the best examples is the factory method programming pattern.