Simple Windows Application using C# || Creating Calculator in Windows form using C#.Net

To implement this concept you need to follow the below steps :

Step1 :

On the File menu, click New Project. Select Windows Forms Application as your project type.

Design the Form using controls from Toolbox.

Step2:

Now open the Form.cs page and write the following source code.

Form1.cs 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 WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

 

        private void clear()

        {

            textBox1.Text = String.Empty;

            textBox2.Text = String.Empty;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            double num1, num2;

            double result;

            num1 = Convert.ToDouble(textBox1.Text);

            num2 = Convert.ToDouble(textBox2.Text);

            result = num1 + num2;

            MessageBox.Show("The Result is " + result.ToString());

            clear(); 

        }

        private void button2_Click(object sender, EventArgs e)

        {

            double num1, num2, result;

            num1 = Convert.ToDouble(textBox1.Text);

            num2 = Convert.ToDouble(textBox2.Text);

            result = num1 - num2;

            MessageBox.Show("The Result is " + result.ToString());

            clear();

        }

        private void button4_Click(object sender, EventArgs e)

        {

            double num1, num2, result;

            num1 = Convert.ToDouble(textBox1.Text);

            num2 = Convert.ToDouble(textBox2.Text);

            result = num1 * num2;

            MessageBox.Show("The Result is " + result.ToString()); 

            clear();

        }

        private void button3_Click(object sender, EventArgs e)

        {

            double num1, num2, result;

            num1 = Convert.ToDouble(textBox1.Text);

            num2 = Convert.ToDouble(textBox2.Text);

            result = num1 / num2;

            MessageBox.Show("The Result is " + result.ToString());

            clear();

        }

        }

    }

Step3:
Now build the Solution and Debug it for the output.

Output: