A Simple Windows Calculater Application using Visual C# for Beginner

In this article, i am going to make a simple calculator in C# using Microsoft Visual Studio.Let's start to make an application.
First open the Microsoft Visual Studio(no matter which version of Visual Studio you have) , and then click file menu at the top left side corner of Visual Studio and finally click new project.

When after clicking a new popup window will open which is shown below. Write the name of the project on the text after the name label and specify the location of project where you want to save it. And then Click OK button.

After Clicking button popup will disappear and it goes back to main windows, now the windows look like this.

Hover through View menu and click toolbox and properties respectively to open toolbox and properties windows and the screenshot will be look like the picture below.

Drag and drop one text box and 17 button from the toolbox on Form1 design window as like above screenshot and click on each button then after change text property of each button as shown above.
And double click on each button to write some code which is execute while clicking it.

//A simple Calculater Program

//Author http://programerzone.blogspot.com

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace Kamal_Calculater

{

    public partial class Form1 : Form

    {

        int value1=0;

        int value2=0;

        char opt;

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "1";

        }

        private void button2_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "2";

        }

        private void button3_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "3";

        }

        private void button4_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "4";

        }

        private void button5_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "5";

        }

        private void button6_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "6";

        }

        private void button7_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "7";

        }

        private void button8_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "8";

        }

        private void button9_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "9";

        }

        private void button10_Click(object sender, EventArgs e)

        {

            textBox1.Text+= "0";

        }

        private void button15_Click(object sender, EventArgs e)

        {

            textBox1.Text+= ".";

        }

        private void button17_Click(object sender, EventArgs e)

        {

            textBox1.Clear();

            textBox1.Focus();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        private void button11_Click(object sender, EventArgs e)

        {

            opt = '/';

            value1= Int32.Parse(textBox1.Text);

            textBox1.Text = "";

            textBox1.Focus();

        }

        private void button12_Click(object sender, EventArgs e)

        {

            opt = '*';

            value1 = 1;

            value1= Int32.Parse(textBox1.Text);

            textBox1.Text = "";

            textBox1.Focus();

        }

        private void button13_Click(object sender, EventArgs e)

        {

           

            opt = '+';

            value1+= Int32.Parse(textBox1.Text);

            textBox1.Clear();

            textBox1.Focus();

        }

        private void button14_Click(object sender, EventArgs e)

        {

            opt = '-';

            value1 =Int32.Parse( textBox1.Text)-value1;

          

            textBox1.Text = "";

            textBox1.Focus();

        }

        private void button16_Click(object sender, EventArgs e)

        {

            int result;

            value2=Int32.Parse(textBox1.Text);

            textBox1.Clear();

            switch (opt)

            {

                case '/':

                    result = value1 / value2;

                    textBox1.Text = result.ToString();

                    value1 = 0;

                   

                    break;

                case '*':

                    result = value1 * value2;

                    textBox1.Text = result.ToString();

                    value1 = 0;

                    break;

                case '+':

                    result = value1 + value2;

                    textBox1.Text = result.ToString();

                    value1 = 0;

                    break;

                case '-':

                    result = value1 - value2;

                    textBox1.Text = result.ToString();

                    value1 = 0;

                    break;

                default:

                    textBox1.Text = "Error";

                    break;

            }

           

        }

    }

}

Now the application is ready to run and press F5 to run it, The final screenshot is below.

Click here to download source code