You cannot call Invoke or BeginInvoke on the control before creating a window handle.

Multi-thread delegation is often used in the C # development process. Today, when I test the software I wrote earlier, I found a problem and reported that before creating a window handle, you cannot call Invoke or BeginInvoke on the control. This error occurs. A careful check is made when a delegate is called, and sometimes the software is shut down. This problem is very serious. Of course, this problem occurs only when I am not operating normally, that is, the problem I did not notice before. When the next delegate is called. First determine the IsHandleCreated on the control or form, as follows: if (this. isHandleCreated) {Methinvoker meth = new Methinvoker (MessSeInfo); this. beginInvoke (meth);} can be avoided in this way, and sometimes the software should be shut down so that the value is Null if the thread is not closed during execution. Just remove this.