protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         User us = (User)Session["user"];
         if (Session["user"] != null)
         {
             GridTransactionHistory.Columns[0].Visible = false;
             if (us.RoleID == 1)
             {
                 // admin do something
                 GridTransactionHistory.Columns[0].Visible = true;
                 GridTransactionHistory.DataSource         = TransactionHistoryController.getAllTransactionHistory();
                 GridTransactionHistory.DataBind();
             }
             else
             {
                 int userID = us.UserID;
                 GridTransactionHistory.DataSource = TransactionHistoryController.getTransactionHistory(userID);
                 GridTransactionHistory.DataBind();
             }
         }
         else
         {
             Response.Redirect("home.aspx");
         }
     }
 }
 protected void Page_Load(object sender, EventArgs e)
 {
     if (Session["user"] != null)
     {
         int userId = Convert.ToInt32(Session["user"]);
         if (UserController.isAdmin(userId) == false)
         {
             viewTransactionHistory.DataSource = TransactionHistoryController.getAllTransactionHistoryById(userId);
             viewTransactionHistory.DataBind();
             viewTransactionReport.Visible = false;
         }
         else
         {
             viewTransactionHistory.DataSource = TransactionHistoryController.getAllTransactionHistory();
             viewTransactionHistory.DataBind();
         }
     }
     else
     {
         Response.Redirect("/View/Home.aspx");
     }
 }