What is a static constructor in C#?

A static constructor is a constructor declared using a static modifier. It is the first block of code executed in a class. With that, a static constructor executes only once in the life cycle of class.

The following is an example of static constructors in C# −

Example

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Difference {    class Demo {       static int val1;       int val2;       static Demo() {          Console.WriteLine("This is Static Constructor");          val1 = 70;       }       public Demo(int val3) {          Console.WriteLine("This is Instance Constructor");          val2 = val3;       }           private void show() {          Console.WriteLine("First Value = " + val1);          Console.WriteLine("Second Value = " + val2);       }       static void Main(string[] args) {          Demo d1 = new Demo(110);          Demo d2 = new Demo(200);          d1.show();          d2.show();          Console.ReadKey();       }    } }