Using static type C# with Example

The using static [Namespace.Type] directive allows the importing of static members of types and enumeration 
values. Extension methods are imported as extension methods (from just one type), not into top-level scope. 
Version ≥ 6.0 
using static System.Console; 
using static System.ConsoleColor; 
using static System.Math; 
class Program 
{ 
static void Main() 
{ 
BackgroundColor = DarkBlue; 
WriteLine(Sqrt(2)); 
} 
} 
Live Demo Fiddle 
Version < 6.0 
using System; 
class Program 
{ 
static void Main() 
{ 
Console.BackgroundColor = ConsoleColor.DarkBlue; 
Console.WriteLine(Math.Sqrt(2)); 
} 
}