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

/// D.A.Applic_ of Arthimatic Calculation by Taking 3 Operands Using Properties Concept.
/// Conditions: 
/// 1. Operand1 should be in range -100 to 100.
/// 2. Operand2 should be lessthan Operand1 & should not be Zero.
/// 3. Operand1 & Operand2 are Wrie-Only Property whereas Operand3 is Read-Only Property
/// 4. 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_1(object sender, EventArgs e)
        {   
            obj.Operand1 = int.Parse(txt_oper1.Text);
            obj.Operand2 = int.Parse(txt_oper2.Text);
        
            foreach (Control ctrl in this.Controls)
            {
                if (ctrl is Button)
                    ctrl.Enabled = true;
            }
        }

        private void btn_GetValue_Click_1(object sender, EventArgs e)
        {        
            txt_result.Text = obj.Result.ToString();
        }

        private void btn_Plus_Click_1(object sender, EventArgs e)
        {
            obj.Add(); 
        }

        private void btn_Subtact_Click_1(object sender, EventArgs e)
        {
            obj.Sub();            
        }

        private void btn_Multiply_Click_1(object sender, EventArgs e)
        {              
            obj.Mul();            
        }

        private void btn_Division_Click_1(object sender, EventArgs e)
        {            
            obj.Div();           
        }
        
        int oper1, oper2;
        private void txt_oper1_Validating(object sender, CancelEventArgs e)
        {
        //Validating for "Oper1"Textbox must be acceptable b/w the Range -100 to 100
         if(txt_oper1.Text.Trim().Length!=0)
                oper1 = Convert.ToInt32(txt_oper1.Text);
            
            if (oper1 > -100 && oper1 < 100)
                return;
            else
            {
                MessageBox.Show("Operand1 value should be in -100 to 100 Range");
                e.Cancel = true;
            }            
        }

        private void txt_oper2_Validating(object sender, CancelEventArgs e)
        {
     //Validating for "Oper2" value should be less than "Oper1" & Should not be zero
            if (txt_oper2.Text.Trim().Length != 0)
                oper2 = Convert.ToInt32(txt_oper2.Text);
            if (oper2 < oper1 && oper2 != 0)
            {
                btn_SetValues.Enabled = true;
                return;
            }
            else
            {
                MessageBox.Show("Operand2 value should be Lessthan Operand1 & 
        Operand2 should not be Zero");
                e.Cancel = true;
            }            
        }

        private void Form2_Load(object sender, EventArgs e)
        {           
            foreach (Control ctrl in this.Controls)
            {
                //MessageBox.Show(ctrl.GetType().ToString());                        
                if(!(ctrl is TextBox) && !(ctrl is Label))
                    ctrl.Enabled = false;
                
                txt_result.Enabled = false;
            }
        }

        private void txt_oper1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //MessageBox.Show(Convert.ToInt32(e.KeyChar).ToString());
            if (char.IsDigit(e.KeyChar)==false && Convert.ToInt32(e.KeyChar)!= 8 
           && Convert.ToInt32(e.KeyChar) != 45)
            {
                MessageBox.Show("Enter Numeric Values Only..");
                e.Handled = true;
            }
        }        
    }
}


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;
        }
    }
}¬¬¬