Static vs. Non-Static method in C#

Declare a member function as static. Such functions can access only static variables. The static functions exist even before the object is created.

A static class cannot be instantiated and can only contain static members.

Static methods is set using static keyword −

public static int getNum() {
   return num;
}

The following example demonstrates the use of static and non-static methods −

Example

using System;

namespace StaticVarApplication {
   class StaticVar {
      public static int num;

      public void count() {
         num++;
      }

      public static int getNum() {
         return num;
      }
   }

   class StaticTester {
      static void Main(string[] args) {
         StaticVar s = new StaticVar();

         s.count();
         s.count();
         s.count();
         s.count();
         s.count();
         s.count();

         Console.WriteLine("Variable num: {0}", StaticVar.getNum());
         Console.ReadKey();
      }
   }
}