How to explicitly call base class constructor from child class in C#?

Make use of this keyword in c# to call one constructor from another constructor To call a constructor which is present in parent class make use of base keyword

Example

To call a constructor which is present in another class make use of base keyword

class DemoBase{    public DemoBase(int firstNumber, int secondNumber, int thirdNumber){       System.Console.WriteLine("Base class Constructor");       System.Console.WriteLine($"{firstNumber} {secondNumber} {thirdNumber}");    } } class Demo : DemoBase{    public Demo(int firstNumber, int secondNumber, int thirdNumber) : base(firstNumber, secondNumber, thirdNumber){       System.Console.WriteLine("Derived class Constructor");       System.Console.WriteLine($"{firstNumber} {secondNumber} {thirdNumber}");    } } class Program{    static void Main(){       Demo obj = new Demo(1, 2, 3);       Console.ReadLine();    } }

Output

Base class Constructor 1 2 3 Derived class Constructor 1 2 3