Calculator/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.Threading.Tasks;
using System.Windows.Forms;

namespace dyakonovcalc
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                label1.Text = "Введите значения";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(a + b);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                label1.Text = "Введите значения";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(a - b);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                label1.Text = "Введите значения";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(a * b);
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            if (textBox2.Text == "0" || textBox2.Text == "")
            {
                label1.Text = "На ноль делить нельзя";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(a / b);
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                label1.Text = "Введите значения";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(Math.Pow(a,b));
            }
        }

        private void button6_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                label1.Text = "Введите значения";
            }
            else
            {
                double a = Convert.ToInt32(textBox1.Text);
                double b = Convert.ToInt32(textBox2.Text);
                textBox3.Text = Convert.ToString(Math.Pow(a, 1/b));
            }
        }
    }
}