using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Leht1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int arv1 = int.Parse(TextBox1.Text);
        int arv2 = int.Parse(TextBox2.Text);
        int tehtenr = DropDownList1.SelectedIndex;
        int vastus = -1;
        if(tehtenr==0){vastus=arv1+arv2;}
        if(tehtenr==1){vastus=arv1-arv2;}
        if(tehtenr==2){vastus=arv1*arv2;}
        if(tehtenr==3){vastus=arv1/arv2;}
        Label1.Text = vastus.ToString();
    }
}