Hesap Makinesi

namespace BABAPROJEHESAPMAKINESI
{
    public partial class Form1 : Form
    {
        int sayi1, sayi2;
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text += "1";

        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += "2";
        }

        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text += "3";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text += "4";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += "5";
        }

        private void button11_Click(object sender, EventArgs e)
        {
            textBox1.Text += "6";
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text += "7";
        }

        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text += "8";
        }

        private void button12_Click(object sender, EventArgs e)
        {
            textBox1.Text += "9";
        }

        private void button16_Click(object sender, EventArgs e)
        {
            textBox1.Text = "+";
            sayi1 = int.Parse(textBox1.Text);
            textBox1.Text = "";
        }

        private void button15_Click(object sender, EventArgs e)
        {
            label1.Text = "-";
            sayi1 = int.Parse(textBox1.Text);
            textBox1.Text = "";
        }

        private void button14_Click(object sender, EventArgs e)
        {
            label1.Text = "*";
            sayi1 = int.Parse(textBox1.Text);
            textBox1.Text = "";
        }

        private void button13_Click(object sender, EventArgs e)
        {
            label1.Text = "/";
            sayi1 = int.Parse(textBox1.Text);
            textBox1.Text = "";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            label1.Text = "";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            sayi2 = int.Parse(textBox1.Text);
            int sonuc;
            if (label1.Text == "+")
            {
                sonuc = (sayi1 + sayi2);
                textBox1.Text = sonuc.ToString();
            }
            if (label1.Text == "-")
            {
                sonuc = (sayi1 - sayi2);
                textBox1.Text = Convert.ToString(sonuc);
            }
            if (label1.Text == "*")
            {
                sonuc = (sayi1 * sayi2);
                textBox1.Text = Convert.ToString(sonuc);
            }
            if (label1.Text == "/")
            {
                sonuc = (sayi1 / sayi2);
                textBox1.Text = Convert.ToString(sonuc);
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += "0";
        }
    }
}