using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            int arv1 = Convert.ToInt32(TextBox1.Text);
            int arv2 = Convert.ToInt32(TextBox2.Text);
            int vastus = arv1 + arv2;
            TextBox3.Text = vastus.ToString();
        }
        catch (Exception ex) {
            TextBox3.Text = "Tekkis viga: " + ex.ToString();
        }
    }
}