Создать цветовой калькулятор с# на visual studio

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на форму label1, textBox1, textBox2, textBox3, button1, button2, button3, this.button4, this.button5, this.button6

в Form1.cs

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();

}

double a, b, result;

private void button1_Click(object sender, EventArgs e)

{

a = Convert.ToDouble(textBox1.Text);

b = Convert.ToDouble(textBox2.Text);

label1.Text = "Сумма";

result = a + b;

textBox3.Text = Convert.ToString(result);

}

private void button2_Click(object sender, EventArgs e)

{

a = Convert.ToDouble(textBox1.Text);

b = Convert.ToDouble(textBox2.Text);

label1.Text = "Разность";

result = a - b;

textBox3.Text = Convert.ToString(result);

}

private void button3_Click(object sender, EventArgs e)

{

label1.Text = "Произведение";

textBox3.Text = Convert.ToString(Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox2.Text));

}

private void button4_Click(object sender, EventArgs e)

{

a = Convert.ToDouble(textBox1.Text);

b = Convert.ToDouble(textBox2.Text);

label1.Text = "Частное";

result = a / b;

textBox3.Text = Convert.ToString(result);

}

private void button5_Click(object sender, EventArgs e)

{

textBox3.Text = Convert.ToString(Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox1.Text));

}

private void button6_Click(object sender, EventArgs e)

{

textBox3.Text = Convert.ToString(Math.Sqrt(Convert.ToDouble(textBox1.Text)));

}

}

}