E2492 Properties may only be assigned using a simple statement, e.g. \"prop = value;\"

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
   MessageBeep(MB_OK) ;
   if (Label1->Caption="Hello, World!")
    Label1->Caption="世界你好!";
   else
     Label1->Caption ="Hello, World!";
}
//---------------------------------------------------------------------------

为什么会出现E2492 Properties may only be assigned using a simple statement, e.g. \"prop = value;\"
这样的错误啊？？？？还有怎么看自己发过的帖子？？？

--------------------编程问答-------------------- 登录后选 ‘论坛”进入社区中心
选"我的小区"
再选"我发布的贴子 "
--------------------编程问答-------------------- 是呀，这是怎么回事呀??? --------------------编程问答-------------------- 知道了，把=改为==就行了

补充：VB ,  非技术类