protected void dgvProducts_SelectedIndexChanged(object sender, EventArgs e)
        {
            String userName = this.dgvUsers.SelectedDataKey.Value.ToString();

            this.IUNGV = new MUserName();

            UserLogin auxUser = IUNGV.GetUserName(userName);

            this.txtUserName.Text          = auxUser.Username;
            this.txtName.Text              = auxUser.Name;
            this.sltUserType.SelectedIndex = auxUser.UserType - 1;
            this.txtLastName.Text          = auxUser.LastName;
        }
        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            try
            {
                String userName     = this.txtUserName.Text;
                String userPassword = this.txtPassword.Text;

                UserLogin auxUser = (UserLogin)iUserNamelGV.GetUserName(userName);

                if (auxUser != null)
                {
                    if (auxUser.Pass == userPassword)
                    {
                        Session["usuario"] = auxUser.Name + " " + auxUser.LastName;
                        if (auxUser.UserType == 0) //Waiter user
                        {
                            Response.Redirect("/UIWaiter/index.aspx");
                        }
                        else // Manager user
                        {
                            Response.Redirect("/UIManager/AddTables.aspx");
                        }
                    }
                }
                else
                {
                    this.lblError.Text        = "Usuario o password in correcto";
                    this.txtUserName.CssClass = "form-control form-control-lg rounded-0 alert-danger";
                    this.txtPassword.CssClass = "form-control form-control-lg rounded-0 alert-danger";
                    this.lblError.Visible     = true;
                }
            }
            catch (Exception)
            {
                throw;
            }
        }