Make simple calculator in c# windows form application

namespace calculator

{

publicpartialclassForm1 : Form

    {

public Form1()

        {

InitializeComponent();

        }

privatevoid button5_Click(object sender, EventArgs e)

        {

            Close();

        }

privatevoid button1_Click(object sender, EventArgs e)

        {

int a = Convert.ToInt32(textBox1.Text);

int b = Convert.ToInt32(textBox2.Text);

            textBox3.Text = Convert.ToString(a + b);

        }

privatevoid button2_Click(object sender, EventArgs e)

        {

int a = Convert.ToInt32(textBox1.Text);

int b = Convert.ToInt32(textBox2.Text);

            textBox3.Text = Convert.ToString(a - b);

        }

privatevoid button3_Click(object sender, EventArgs e)

        {

int a = Convert.ToInt32(textBox1.Text);

int b = Convert.ToInt32(textBox2.Text);

            textBox3.Text = Convert.ToString(a * b);

        }

privatevoid button4_Click(object sender, EventArgs e)

        {

int a = Convert.ToInt32(textBox1.Text);

int b = Convert.ToInt32(textBox2.Text);

            textBox3.Text = Convert.ToString(a / b);

        }

privatevoid button6_Click(object sender, EventArgs e)

        {

            textBox1.Clear();

        }

privatevoid button7_Click(object sender, EventArgs e)

        {

            textBox2.Clear();

        }

privatevoid label1_Click(object sender, EventArgs e)

        {

        }

    }

}

c# windows form application