help

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Security.Cryptography;
using System.ComponentModel;
using System.Text;

public partial class Register : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        signUpFail.Visible = false;
        signUpSuccess.Visible = false;
        passwordFail.Visible = false;
        DEBUGMESSAGE.Visible = false;
    }

    protected void registerButton_Click(object sender, EventArgs e)
    {
        string IndvConnString = System.Configuration.ConfigurationManager.ConnectionStrings["LocalConnectionString"].ConnectionString;
        OleDbConnection IndvSignCon = new OleDbConnection(IndvConnString);

        IndvSignCon.Open();

        Type csType = this.GetType();
        // check to ensure that UserId keyed in is not being in used by other Customers
        OleDbCommand cmd;
        OleDbDataReader rdr;

        string strSQLSelect = "SELECT uEmail FROM Users ORDER BY uEmail";
        cmd = new OleDbCommand(strSQLSelect, IndvSignCon);
        rdr = cmd.ExecuteReader();

        while (rdr.Read())
        {
            if (email_textbox.Text == (string)rdr["uEmail"])
            {
                signUpFail.Visible = true;
                IndvSignCon.Close();
                return;
            }

            const int MIN_LENGTH = 10;

            string password = password_textbox.Text;

            if (password.Length < MIN_LENGTH)
            {
                passwordFail.Visible = true;
                IndvSignCon.Close();
                return;
            }

            string sSourceData;
            byte[] tmpSource;
            byte[] tmpHash;

            sSourceData = password_textbox.Text;

            tmpSource = ASCIIEncoding.ASCII.GetBytes(sSourceData);

            //Compute Hash
            tmpHash = new MD5CryptoServiceProvider().ComputeHash(tmpSource);

            // insert new record
            string strSQLInsert = "INSERT INTO "
                + " Users  (uName, uPass, uEmail, uNo, uEmerName, uEmerNo, uEmerRe)"
                + " VALUES (@name, @pw, @em, @hp, @emername, @emerhp, @emerrel)";

            cmd = new OleDbCommand(strSQLInsert, IndvSignCon);

            cmd.Parameters.AddWithValue("@name", name_textbox.Text);
            cmd.Parameters.Add("@pw", OleDbType.VarBinary, 64).Value = tmpHash;
            cmd.Parameters.AddWithValue("@em", email_textbox.Text);
            cmd.Parameters.AddWithValue("@hp", phone_textbox.Text);
            cmd.Parameters.AddWithValue("@emername", emerName_textbox.Text);
            cmd.Parameters.AddWithValue("@emerhp", emerNo_textbox.Text);
            cmd.Parameters.AddWithValue("@emerrel", emerRel_dropdown.Text);

            cmd.ExecuteNonQuery();
            IndvSignCon.Close();

            signUpSuccess.Visible = true;

        }
    }
}