how to multiply two combo box value and put the output into textbox

Hi Nar,

Please tell me this is a windows apps or web apps,you should be clear about that.In the above post you have mentioned about combobox and using asp.net with csharp.What is this?

Second thing

diesel consumed  textbox  combox1 combox2

                                               20             15

out put as          3000

By multiply 20*15=300


Please ask your questions clearly so that you will get correct answer.



using asp.net with csharp

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication4._Default" %>





   


   

   

       
       

       
       

       
   

   
   




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

namespace WebApplication4
{
    public partial class _Default : System.Web.UI.Page
    {
      

        protected void Button1_Click(object sender, EventArgs e)
        {
            double d1 = Convert.ToDouble(DropDownList1.SelectedItem.Text.ToString());
            double d2 = Convert.ToDouble(DropDownList2.SelectedItem.Text.ToString());
            TextBox1.Text = (d1 * d2).ToString();
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DropDownList1.Items.Add("20");
                DropDownList2.Items.Add("15");
            }
           
        }
    }
}



Thanks

in button click

textbox1.Text= int32.Parse(cmb1.SelectedValue.ToString())*int32.Parse(cmb2.SelectedValue.ToString())