Add two values with the healp of constructor in c# programming

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace A_B
{
    class Add
    {
        int a, b;
        public Add()
        {
            Console.WriteLine("Enter A value=");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter B value=");
            b = Convert.ToInt32(Console.ReadLine());
        }
        public Add(int a, int b)
        {
            this.a = a;
            this.b = b;
        }
        public int GetSum()
        {
            return a + b;
        }
    }
    class myclass
    {
        static void Main(string[] args)
        {
            Add obj1 = new Add();
            int sum = obj1.GetSum();
            Console.WriteLine("Sum of A+B=" + sum);
            Console.ReadKey();
        }
    }

}