Static Classes C# with Example

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 
} 
}