C# da İstenilen İşlemi Yapan Program

c#

public Form1()

        {

            InitializeComponent();

        }

        Random r;

            r = new Random();

        int a, b,c;

        private void button1_Click(object sender, EventArgs e)

        {

           

          

            a = r.Next(10, 100);

            b = r.Next(10, 100);

            textBox1.Text = a + "   ";

            textBox2.Text = b + "    ";

        }

        private void button2_Click(object sender, EventArgs e)

        {

           

            if (comboBox1.SelectedItem == "toplama" )

            {

                c = a + b;

            }

            else if (comboBox1.SelectedItem == "çıkarma")

 {

     c = a - b;

 }

            label4.Text = c.ToString();

        }