What are static classes in C#?

C# Static classes cannot be instantiated and can only have static members. Static classes in C# are sealed and cannot contain instance constructors.

The following is an example containing static class and static members-

Example

using System;

public static class Demo {
   public static float PI = 3.14f;
   public static int calc(int n){return n*n;}
}

class Program {

   public static void Main(string[] args) {
      Console.WriteLine("PI: "+Demo.PI);
      Console.WriteLine("Square: " + Demo.calc(3));
   }
}

Above, the static class is-

public static class Demo {
   public static float PI = 3.14f;
   public static int calc(int n){return n*n;}
}

Above we have the following static members -

public static float PI = 3.14f;
public static int calc(int n){return n*n;}

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