The “static” keyword when referring to a class has three effects:

1. You cannot create an instance of a static class (this even removes the default constructor)
2. All properties and methods in the class must be static as well.
3. A static class is a sealed class, meaning it cannot be inherited.

public static class Foo
{

//Notice there is no constructor as this cannot be an instance public static int Counter { get; set; } public static int GetCount() { return Counter; }

}

public class Program 
{

static void Main(string[] args) { Foo.Counter++; Console.WriteLine(Foo.GetCount()); //this will print 1

//var foo1 = new Foo(); 
//this line would break the code as the Foo class does not have a constructor

}

}