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

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

    }
    protected void kytusevalik_SelectedIndexChanged(object sender, EventArgs e)
    {
        vastus.Text = kytusevalik.SelectedValue;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            vastus.Text = (Decimal.Parse(kytusevalik.SelectedValue.Replace(".", ",")) * 
                   Convert.ToDecimal(kogus.Text)).ToString();
        }
        catch (Exception ex) { 
           vastus.Text="Probleem: "+ex.Message;
        }
    }
}