Static Class

1. Cannot derive from Static Class
2. Cannot create instance of Static class using new keyword
3. Static class can be public or internal
4. Static class can NOT be private or protected or protected internal
5. Static class can NOT have non-static members

1) 

static class ThisClassIsStatic

{

    static string comment;

    static int count = 0;

}

class ThisIsDervied : ThisClassIsStatic   //NOT POSSIBLE

{

}

2)

ThisClassIsStatic obj = new ThisClassIsStatic(); //NOT POSSIBLE

3) 

public static class ThisClassIsStatic  //POSSIBLE

{

}

4)
private static class ThisClassIsStatic  //NOT POSSIBLE

5)
    static class ThisClassIsStatic
    {
        static string comment;
        static int count = 0;
        int index = 0; //NOT POSSIBLE

    }