using System;

public class Program

{

    public static void Main()

    {

        double arg1, arg2, result;

        void GetNumbers()

        {

            try

            {

                arg1 = double.Parse(textBox1.Text);

            }

            catch (FormatException)

            {

                arg1 = 0.0;textBox1.Text = "0";

            }

            try

            {

                arg2 = double.Parse(textBox2.Text);

            }

            catch (FormatException)

            {

                arg2 = 0.0; textBox2.Text = "0";

            }

​

        }

        void ShowResult(double result)

        {

            label1.Text = result.ToString();

        }

​

        private void button2_Click(object sender, EventArgs e)

        {

            GetNumbers(); ShowResult(arg1 - arg2);

        }

​

        private void button3_Click(object sender, EventArgs e)

        {

            GetNumbers(); ShowResult(arg1 * arg2);

        }

​

        private void button5_Click(object sender, EventArgs e)

        {

            GetNumbers(); ShowResult(arg1 % arg2);

        }

​

        private void button6_Click(object sender, EventArgs e)

        {

            arg1 = 0;

            arg2 = 0;

        }

​

        private void button1_Click(object sender, EventArgs e)

        {

            GetNumbers(); ShowResult(arg1 + arg2);

        }

​

        private void button4_Click(object sender, EventArgs e)

        {

            GetNumbers(); ShowResult(arg1 / arg2);

        }

    }

}

    }

}