A Task Management System using Three Layer Architecture

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

public partial class UI_CreateUser : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string userId = Session["userId"].ToString();
        string userRole = Session["userRole"].ToString();
        this.Master.userId = userId;
        this.Master.UserRole = userRole;
    }
    protected void createUserButton_Click(object sender, EventArgs e)
    {
        EmployeeBLL employeeBllObj = new EmployeeBLL();
        employeeBllObj.CreateUser(userIdDropDownList.Text, passwordTextBox.Text);
        Response.Redirect("CreateUser.aspx");
    }
}