thread locks form

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C++

Hello,


I'm building a simple program that sends emails. The program has 2 buttons start and cancel. If i click start it creates a thread a start sending email and updating a progress bar when i press cancel it stops the thread.

Now, i've managed to create the thread but it can't access the progress bar because it was created in another thread.

To solve this i've implement invoke the problem is that using invoke it locks the program similar to not be using threads at all.

I need to know how to fiz this urgent.

Cumpz,