c# constructor chaining

class  {
	string _studengType = "";
	string _id = "";
	string _fName = "";
	string _lName = "";

	public (string id) : this(id, "", ""){

	}

	public (stirng id, string fName) : this(id, fName, ""){

	}

	public (string id, string fName, string lName){
		
		_studentType = "<student_type>";

		_id = id;
		_fName = fName;
		_lName = lName;
	}
}