Thread: How to add a multiply & division buttons???

Code:

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 calculator2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void txtDisplay_TextChanged(object sender, EventArgs e)
        {

        }
        double total1 = 0;
        double total2 = 0;
        double answer;

        private void btnOne_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnOne.Text;
        }
        private void btnTwo_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnTwo.Text;
        }
        private void btnThree_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnThree.Text;
        }
        private void btnFour_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnFour.Text;
        }
        private void btnFive_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnFive.Text;
        }
        private void btnSix_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnSix.Text;
        }
        private void btnSeven_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnSeven.Text;
        }
        private void btnEight_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnEight.Text;
        }
        private void btnNine_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnNine.Text;
        }
        private void btnZero_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnZero.Text;
        }
        private void btnClear_Click(object sender, EventArgs e)
        {
            txtDisplay.Clear();
        }
        private void btnPlus_Click(object sender, EventArgs e)
        {
            total1 = total1 + double.Parse(txtDisplay.Text);
            txtDisplay.Clear();

            plusButtonClicked = true;
            minusButtonClicked = false;
            divideButtonClicked = false;
            multiplyButtonClicked = false;
        }
        private void btnEquals_Click(object sender, EventArgs e)
        {
            if (plusButtonClicked == true)
                
            {
                total2 = total1 + double.Parse(txtDisplay.Text);
               
            }
            if (multiplyButtonClicked == true)
            {
                total2 = total1 * double.Parse(txtDisplay.Text);
            }
            else if (minusButtonClicked == true)
            {
                total2 = total1 - double.Parse(txtDisplay.Text);

            }
            else if (divideButtonClicked == true)
            {
                total2 = total1 / double.Parse(txtDisplay.Text);
            }
            txtDisplay.Text = total2.ToString();
            total1 = 0;
        }
        private void btnPoint_Click(object sender, EventArgs e)
        {
            txtDisplay.Text = txtDisplay.Text + btnPoint.Text;
        }
        bool plusButtonClicked = false;
        bool minusButtonClicked = false;
        bool divideButtonClicked = false;
        bool multiplyButtonClicked = false;
        private void btnMinus_Click(object sender, EventArgs e)
        {
            total1 = total1 + double.Parse(txtDisplay.Text);
            txtDisplay.Clear();

            minusButtonClicked = true;
            plusButtonClicked = false;
            divideButtonClicked = false;
            multiplyButtonClicked = false;
        }
        
        private void btnMultiply_Click(object sender, EventArgs e)
        {
            total1 = total1 / double.Parse(txtDisplay.Text);
            multiplyButtonClicked = true;
            divideButtonClicked = true;
            minusButtonClicked = false;
            plusButtonClicked = false;
            txtDisplay.Clear();
        }

        private void btnDivide_Click(object sender, EventArgs e)
        {
            total1 = total1 / double.Parse(txtDisplay.Text);
            multiplyButtonClicked = true;
            divideButtonClicked = true;
            minusButtonClicked = false;
            plusButtonClicked = false;
            txtDisplay.Clear();
           
        }
    }
}