Constructor Chaining With Example In C#

namespace Consolepractice {
    class Program {
        public static void Main(string[] args) {
            student on = new student("Soumalya", "132", "M", "7278283469");
            Console.ReadKey();
        }
    }
    class student {
        private string _name;
        private string _roll;
        private string _gender;
        private string _phn;
        public student() {
            Console.WriteLine("default");
        }
        public student(string Name): this() {
            this._name = Name;
        }
        public student(string Name, string Roll): this(Name) {
            this._roll = Roll;
        }
        public student(string Name, string Roll, string Gender): this(Name, Roll) {
            this._gender = Gender;
        }
        public student(string Name, string Roll, string Gender, string Phn): this(Name, Roll, Gender) {
            this._phn = Phn;
        }
    }
}