/// <summary>
        /// calls add new user in data access layer
        /// </summary>
        protected void btSignUp_Click(object sender, EventArgs e)
        {
            try
            {
                String empId = tbEmployeeId.Text.Trim();
                String firstName = tbFirstName.Text.Trim();
                String lastName = tbLastName.Text.Trim();
                String emailId = tbEmailId.Text.Trim();
                String password = tbPassword.Text;

                DataAccessLayer dal = new DataAccessLayer();
                int? ret = dal.AddNewUser(empId, firstName, lastName, emailId, password);
                switch (ret)
                {
                    case -1:
                        {
                            loginbox.Style.Add("display", "none");
                            signupbox.Style.Add("display", "inline");
                            signupalert.Style.Add("display", "inline");
                            signupalert.Attributes.Add("class", "alert-danger");
                            signupalert.InnerText = "Account with this Employee ID already exists.";
                            break;
                        }
                    case 0:
                        {
                            loginbox.Style.Add("display", "none");
                            signupbox.Style.Add("display", "inline");
                            signupalert.Style.Add("display", "inline");
                            signupalert.Attributes.Add("class", "alert-danger");
                            signupalert.InnerText = "Some Error Occured. Try Again Later.";
                            break;
                        }
                    case 1:
                        {
                            signupbox.Style.Add("display", "none");
                            loginbox.Style.Add("display", "inline");
                            loginAlert.Style.Add("display", "inline");
                            loginAlert.Attributes.Add("class", "alert-success");
                            loginAlert.InnerText = "Account Created. Please Sign In to Continue.";
                            break;
                        }
                    
                }
                }
            catch
            {
                throw;
            }
        }