How to Create a Calculator Using C# with asp.net visual studio .

Here i made a calculator for beginners . The beginners must  follow the codes . but not do copy and paste . at first you must understand that and then you can try to build your own codes . One thing is mind did when you will build your own logic then you can do anything . So try and gain success. By Syed maftahur Rahman Sohel .

The Graphical Interface :

The 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 calculator

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void btnone_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnone.Text;

        }

        private void btntwo_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btntwo.Text;

        }

        private void btnthree_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnthree.Text;

        }

        private void btnfour_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnfour.Text;

        }

        private void btnfive_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnfive.Text;

        }

        private void btnSix_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnSix.Text;

        }

        private void btnSeven_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnSeven.Text;

        }

        private void btnEight_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnEight.Text;

        }

        private void btnNine_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnNine.Text;

        }

        private void btnZero_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnZero.Text;

        }

        private void btnClear_Click(object sender, EventArgs e)

        {

            textDisplay.Clear();

        }

        double total1 = 0.0;

        bool plusButtonClicked = false;

        bool minusButtonClicked = false;

        bool mulButtonClicked = false;

        bool divButtonClicked = false;

       

        private void btnPlus_Click(object sender, EventArgs e)

        {

            total1 = (double)total1 + double.Parse(textDisplay.Text);

            textDisplay.Clear();

            plusButtonClicked = true;

            minusButtonClicked = false;

            mulButtonClicked = false;

            divButtonClicked = false;

        }

        double total2 = 0;

        private void btnEqual_Click(object sender, EventArgs e)

        {

            if (plusButtonClicked == true)

            {

                total2 = (double)total1 + double.Parse(textDisplay.Text);

            }

            else if (minusButtonClicked == true)

            {

                total2 = (double)total1 - double.Parse(textDisplay.Text);

            }

            else if (mulButtonClicked == true)

            {

                total2 = (double)total1 * double.Parse(textDisplay.Text);

            }

            else if (divButtonClicked == true)

            {

                total2 = (double)total1 / double.Parse(textDisplay.Text);

            }

            textDisplay.Text = total2.ToString();

            total1 = 0;

        }

        private void btnPoint_Click(object sender, EventArgs e)

        {

            textDisplay.Text = textDisplay.Text + btnPoint.Text;

        }

        private void btnMinus_Click(object sender, EventArgs e)

        {

            total1 = (double)total1 + double.Parse(textDisplay.Text);

            textDisplay.Clear();

           

            minusButtonClicked = true;

            plusButtonClicked = false;

            mulButtonClicked = false;

            divButtonClicked = false;

        }

        private void btnMul_Click(object sender, EventArgs e)

        {

            total1=(double)total1+double.Parse(textDisplay.Text);

            textDisplay.Clear();

            mulButtonClicked = true;

            minusButtonClicked = false;

            plusButtonClicked = false;

           

            divButtonClicked = false;

        }

        private void btnDivide_Click(object sender, EventArgs e)

        {

            total1 = (double)total1 + double.Parse(textDisplay.Text);

            textDisplay.Clear();

            divButtonClicked = true;

            mulButtonClicked = false;

            minusButtonClicked = false;

            plusButtonClicked = false;

        }

    }

}