How to debug web form

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C#

ASP.NET

C#4.0

hi
i have developed a web application,having a web form DataTransaction.aspx
when i run this by setting "run as start up" in browser am observing

localhost:3038/DataTransaction.aspx----->upto this fine.

but i want to trace (by keeping break points) with url:
localhost:3038/DataTransaction.aspx?MID=mach1&&CNUM=c1&AMT=1000&TOT=01022014112233&UPWD=op1&TT=1


here is my form code behind code:

<pre lang="c#">using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MySql.Data.MySqlClient;
using System.Web.Configuration;

namespace Online_Billing_System
{
    public partial class DataTransaction : System.Web.UI.Page
    {
        String ConnectionString = WebConfigurationManager.ConnectionStrings["myConnectionString"].ToString();


        bool found = false;
        String memberid, name, phonenumber;
        decimal openbal, due;


        protected void Page_Load(object sender, EventArgs e)
        {
            String machineid = Request.QueryString["MID"];
            String cardid = Request.QueryString["CNUM"];
            decimal paidamount = Convert.ToDecimal(Request.QueryString["AMT"]);
            String paiddate = Request.QueryString["TOT"];
            String operatorid = Request.QueryString["UPWD"];


            if (machineid != null && cardid != null && paidamount != 0 && paiddate != null && operatorid != null)
            {
                if (Convert.ToInt32(Request.QueryString["TT"]) == 1)
                {
                    using (MySqlConnection con = new MySqlConnection(ConnectionString))
                    {
                        // whether operator id exist or not

                        String browseroperatorid = Request.QueryString["UPWD"].ToString();
                        String query = "select operator_id from operator";
                        MySqlCommand command = new MySqlCommand(query, con);
                        con.Open();
                        using (MySqlDataReader rdr = command.ExecuteReader())
                        { 
                            
                           while(rdr.Read())
                            {
                            String dboperatorid = rdr["operator_id"].ToString();

                            if (dboperatorid.Equals(browseroperatorid))
                            {
                                found = true;
                                break;

                            }

                        }
                        }

                        if (found == true)
                        {
                            // get the details from admin based on card id if operator id exist

                            String selectquery = "select * from admin where card_id= '" + cardid + "'";
                            MySqlCommand command1 = new MySqlCommand(selectquery, con);
                            using (MySqlDataReader rdr = command1.ExecuteReader())
                            {
                                if (rdr.Read())
                                {
                                    memberid = rdr["member_id"].ToString();
                                    name = rdr["name"].ToString();
                                    phonenumber = rdr["phone_number"].ToString();
                                    openbal = Convert.ToDecimal(rdr["opening_balance"].ToString());
                                    due = openbal - paidamount;
                                }
                                // card id does not exist
                                else
                                    Response.Write("$TS=2#");
                            }
                            // insert new record into trasaction


                            String insertquery = "insert into transaction(machine_id,operator_id,member_id,card_id,name,paid_amount,due_amount,paid_date,phone_number) values(@machineid,@operatorid,@memberid,@cardid,@name,@paidamount,@dueamount,@paiddate,@phone) ";
                            MySqlCommand command2 = new MySqlCommand(insertquery, con);
                            command2.Parameters.AddWithValue("@machineid", machineid);
                            command2.Parameters.AddWithValue("@operatorid", operatorid);
                            command2.Parameters.AddWithValue("@memberid", memberid);
                            command2.Parameters.AddWithValue("@cardid", cardid);
                            command2.Parameters.AddWithValue("@name", name);
                            command2.Parameters.AddWithValue("@paidamount", paidamount);
                            command2.Parameters.AddWithValue("@dueamount", due);
                            
                            if (paiddate.Length == 14)
                            {
                                string format = "ddMMyyyyHmmss";

                                DateTime dateTime = DateTime.ParseExact(paiddate, format,
                                    System.Globalization.CultureInfo.InvariantCulture);

                                String result = dateTime.ToString("yyyy-MM-dd H:mm:ss");
                                command2.Parameters.AddWithValue("@paiddate", result);

                            }
                            else//if date does not contain 14 digits,Invalid Transaction.
                            {
                                Response.Write("$TS=2#");
                            }
                                command2.Parameters.AddWithValue("@phone", phonenumber);
                            command2.ExecuteNonQuery();

                            Response.Write("$AMT='" + paidamount + "'|BAL='" + due + "'|TS=1# ");


                            //update admin with due amount
                            String updatequery = "update admin set opening_balance='" + due + "' where card_id='" + cardid + "' ";
                            MySqlCommand command3 = new MySqlCommand(updatequery, con);
                            command3.ExecuteNonQuery();
                        }
                        // invalid operator id
                        else
                            Response.Write("$TS=3#");
                    }
                }
                else
                    if (Convert.ToInt32(Request.QueryString["TT"]) == 2)
                    {
                        using (MySqlConnection con = new MySqlConnection(ConnectionString))
                        {
                            String browseroperatorid = Request.QueryString["UPWD"].ToString();
                            String query = "select operator_id from operator";
                            MySqlCommand command = new MySqlCommand(query, con);
                            con.Open();
                            using (MySqlDataReader rdr = command.ExecuteReader())
                            {

                                while (rdr.Read())
                                {
                                    String dboperatorid = rdr["operator_id"].ToString();

                                    if (dboperatorid.Equals(browseroperatorid))
                                    {
                                        found = true;
                                        break;

                                    }

                                }
                            }
                            if (found == true)
                            {

                                String query1 = "select opening_balance from admin where card_id='" + cardid + "' ";
                                MySqlCommand command1 = new MySqlCommand(query1, con);
                                using (MySqlDataReader rdr = command.ExecuteReader())
                                {
                                    if (rdr.Read())
                                    {
                                        String bal = rdr["opening_balance"].ToString();
                                        Response.Write("$ BAL='" + bal + "'|TS=1#   ");

                                    }
                                    else// card id does not exist
                                        Response.Write("$ TS=2# ");
                                }

                            }
                            else//operator id does not exist
                                Response.Write("$TS=3#");
                        }


                    }
                    else
                        if (Convert.ToInt32(Request.QueryString["TT"]) == 3)
                        {

                            using (MySqlConnection con = new MySqlConnection(ConnectionString))
                            {
                                String browseroperatorid = Request.QueryString["UPWD"].ToString();
                                String query = "select operator_id from operator";
                                MySqlCommand command = new MySqlCommand(query, con);
                                con.Open();
                                using (MySqlDataReader rdr = command.ExecuteReader())
                                {

                                    while (rdr.Read())
                                    {
                                        String dboperatorid = rdr["operator_id"].ToString();

                                        if (dboperatorid.Equals(browseroperatorid))
                                        {
                                            found = true;
                                            break;

                                        }

                                    }
                                }
                                if (found == true)
                                { 
                                
                                
                                
                                
                                
                                }

                            }
                        
                        }
            //invalid transaction
            }
            else
                Response.Write("$TS=2#");
            
        }
    }
}

How to check it.