how to access a control from another thread which didn't create this control.
I faced this issue more than 1 time, I decided to collect info about it and made some changes on the code to simplify this problem to you cause it's really annoying and confusing to work with threading stuff. Here is a small code solves this problem FOREVER and in ANY case. Error:
Cross thread operation not valid: Control "XXXXXXXXXX" accessed from a thread other than the thread it was created. Solution:
1- Create your thread:
Private Strt As System.Threading.Thread
2- Start your thread wherever you want:
Strt = New System.Threading.Thread(AddressOf MyThread1)
3- Add the thread sub (MyThread1) and put whatever you want and remember that the lines which access a control from this thread will be separated to into another sub (the Delegate sub)
From the previous code you will notice 2 things:
1st: AccessControl the sub which will be delegated.
2nd: ' Working code - which doesn't need a delegate to get it work. In other mean, it doesn't show up the error message you receive.
4- and finally, add the delegated sub:
Private Sub AccessControl()
If Me.InvokeRequired Then
Me.Invoke(New MethodInvoker(AddressOf AccessControl))
Button2.Visible = True
Button3.Visible = True
Opacity = 1
ShowInTaskbar = True
From the previous code you will notice that all the codes which wasn't working in the threading sub will be added after "Else" line.
examples for some codes which needs to be delegated:
I hope i simplified it enough, and now no worry about this issue again.
Special thanks to jmcilhinney
for his help. You can also find this article at this link:http://www.bitsnips.com/forums/viewtopic.php?p=102#102
Have a nice day