winform: Cross-thread operation not valid: Control 'XXX' accessed from a thread other than

C#,  System.Timers.Timer的ElapsedEventHandler事件中，调用界面上的label时报错：

Cross-thread operation not valid: Control 'tbxCurrSection' accessed from a thread other than the thread it was created on.

跨线程调用的问题。

想起之前用Thread.start时的解决方案，用InvokeRequired来判断，在这里不行，继续报错。

if (tbxCurrSection.InvokeRequired)  //不行
{ 
    MethodInvoker ivk = updateInfoSection; 
    tbxCurrSection.BeginInvoke(ivk); 
}

 在stackoverflow上找到了答案：

https://stackoverflow.com/questions/24085983/how-to-fix-a-cross-thread-exception-in-c

设置timer的SynchronizingObject属性

//...
timerL2.SynchronizingObject = this; //this就是窗体本身
//...

问题解决。