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Thank you all. I am wrong along all the way I need using threading for this. Thank you again.

Hi Andrzejek and thank you very much. The while loop is ok. Because if I firstly click display message button the while enter into an infinite loop because flag is false. and now clicking flag button to change Boolean variable to true and then the message is displayed. This work ok. But from...

You can compile by this command line. C:\WINDOWS\Microsoft.NET\Framework\v3.5\vbc /target:winexe samples_form1.vb >> f1.txt And test it.

mintjulep Hi and thank you very much. The variable is in scope because if Firstly I click the button to make flag = true then the message is displayed. When I click display message button. But if I firstly click display message button when the flag = false then the spp stack. Thank you very much.

Thank you all ' 'if I click Display message no message are displayed becaus flag is False 'When i click the button falg false to flip it to flag True. 'the app do not react. ' 'how I can make this simple app to react when fliping bettween 'true and false 'I am very thank you for any help ' '...

Hi I have a form with one button and one textbox In the button event I set a boolean flag that also exists in another form method that control a loop (exit from loop) My question is this control is ok If not what I need to do. Thank you.

Forgot to say. I am using vb.net

Hi I have a form with one button and one textbox In the button event I set a boolean flag that also exists in another form method that control a loop (exit from loop) My question is this control is ok If not what I need to do. Thank you.