registration page problem ?

Try

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="WebApplication17.WebForm3" %>





   


   

   

   

   

   

   

   

   

   
   

   
   

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 WebApplication17
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        int rent = 0, acost = 0;

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (RadioButton1.Checked==true)
                rent = Convert.ToInt32(RadioButton1.ToolTip);
            else if (RadioButton2.Checked == true)
                rent = Convert.ToInt32(RadioButton2.ToolTip);

            if (CheckBox1.Checked == true)
                acost = Convert.ToInt32(CheckBox1.ToolTip);
            if (CheckBox2.Checked == true)
                acost = Convert.ToInt32(CheckBox2.ToolTip);
            int total = acost + rent;

            Label1.Text = "registered " + "" + TextBox1.Text + ":rent/day
" + total;
            clear();
        }
        void clear()
        {
            TextBox1.Text = "";

            RadioButton1.Checked = false;
            RadioButton2.Checked = false;
            CheckBox1.Checked = false;
            CheckBox2.Checked = false;
        }

    }
}