C# Code:Arthimatic Calculation by Taking 3 Operands Using Properties Concept -II

/// D.A.Applic_ of Arthimatic Calculation by Taking 3 Operands Using Properties Concept. 
Conditions:  1. Operand1 & Operand2 are Wrie-Only Property whereas Operand3 is Read-Only Property 
2. Computation of Methods(Add,Sub,Mul,Div) should be in seperate Class file
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Property_Calulator1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        Math obj = new Math();

        private void btn_SetValues_Click(object sender, EventArgs e)
        {
            obj.Operand1 = int.Parse(txt_oper1.Text);
            obj.Operand2 = int.Parse(txt_oper2.Text);
            btn_GetValue.Enabled = false;
        }

        private void btn_GetValue_Click(object sender, EventArgs e)
        {
            txt_result.Text = obj.Result.ToString();
        }

        private void btn_Plus_Click(object sender, EventArgs e)
        {
            obj.Add();
            btn_GetValue.Enabled = true;
        }

        private void btn_Subtact_Click(object sender, EventArgs e)
        {
            obj.Sub();
            btn_GetValue.Enabled = true;
        }

        private void btn_Multiply_Click(object sender, EventArgs e)
        {
            obj.Mul();
            btn_GetValue.Enabled = true;
        }

        private void btn_Division_Click(object sender, EventArgs e)
        {
            int b = int.Parse(txt_oper2.Text );
            if (b != 0)
            {
                obj.Div();
                btn_GetValue.Enabled = true;
            }
            else
                MessageBox.Show("Operand2 must not be zero");
        }        
    }
}

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

namespace Property_Calulator1
{
    class Math
    {
        /// Property Fields
        private int _operand1;
        private int _operand2;
        private double _result;

        /// Properties
        public int Operand1
        {
            set { _operand1 = value; }
        }

        public int Operand2
        {
            set { _operand2 = value; }
        }

        public double Result
        {
            get { return _result; }
        }

        public double GetValue()
        {
            return Result;  //return _result;
        }

        public void Add()
        {
            _result = _operand1 + _operand2;//Result = Operand1 + Operand2;          
        }

        public void Sub()
        {
            _result = _operand1 - _operand2;
        }

        public void Mul()
        {
            _result = _operand1 * _operand2;
        }

        public void Div()
        {
            _result = _operand1 / _operand2;
        }
    }
}