ASP.NET

protected void PostRegister_Click1(object sender, EventArgs e)
    {
      if (!(String.IsNullOrEmpty(UserName.Text) || String.IsNullOrEmpty(RegisterBox.Text)))
      {
        MembershipUser user = Membership.GetUser(UserName.Text.ToString());
        if (user == null)
        {
          user = Membership.CreateUser(UserName.Text.ToString(), "gendac!@#", RegisterBox.Text.ToString());
          user.IsApproved = false;
          Membership.UpdateUser(user);
        }
        else
           return; //TODO, error

        String email = RegisterBox.Text.ToString();

        string link = "http://localhost:32781/" + "Confirmation.aspx?UserID=" + user.ProviderUserKey.ToString(); // TODO: Make dynamic
        try
        {
          //create the mail message
          System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();

          //set the addresses
          mail.From = new MailAddress("hugo@gendac.co.za");
          mail.To.Add(email);

          //set the content
          mail.Subject = "Click the link to register.";
          mail.Body = link;

          //send the message
          SmtpClient smtp = new SmtpClient("127.0.0.1"); // Make dynamic

          //to authenticate we set the username and password properites on the SmtpClient
          smtp.Credentials = new NetworkCredential("hugo", "blaaaaa");
          smtp.Send(mail);
        }
        catch (Exception ex)
        {
          System.Diagnostics.Trace.WriteLine(ex.Message);
        }
      }

    }

public partial class Confirmation : System.Web.UI.Page
  {
    protected void Page_Load(object sender, EventArgs e)
    {
      String userKey = (Request.QueryString["UserID"].ToString());
      Guid guid = new Guid(userKey);
      if (userKey != null)
      {
        MembershipUser user = Membership.GetUser(guid);
        if (user != null)
        {
          user.IsApproved = true;
          Membership.UpdateUser(user);
          Message.Text = String.Format("Welcome {0}, you are now registered", user.UserName);
        }
        else
          Message.Text = String.Format("Invalid user ID");
      }
    }
  }