Static concept in class

•  A static class cannot be instantiated
• Static classes are sealed and therefore cannot be inherited.

        static class Abc{ }

    compiles to this IL:

    

    .class private abstract auto ansi sealed beforefieldinit Abc

     extends [mscorlib]System.Object

    {

    }

• Static methods can be overloaded but not overridden
• Creating a static class is same as a class that contains only static members and a private constructor, because private constructor prevents the class being instantiated.
• Static methods are held only once in a memory.
• They cannot contain instance constructors.

• Example

    using System;

    class Program

    {

       static void Main()

       {

        StaticClass.StaticMethod();

        Console.ReadLine();

       }

    }

    static class StaticClass

    {

      internal static void StaticMethod()

      {

        Console.WriteLine("Inside Static Method");

      }

    }

• O/P

• Static Constructor

1. These are used to initialize any static data, only once
2. A static constructor has no parameters
3. It is run automatically by the run time. It is guaranteed to run at most once even if two threads arrive at the same time.

• Example (Console class)

     Console.WriteLine("Anurag");

     Console.ReadLine();

• Example (String class)