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Help With Visual Basic coding

Hi there ....I want to make something in vb (an application which i made to work with the arduino uno)  and i put a notification icon (in a timer). But i want everytime the value from the arduino uno change send me a message with the notification icon that the value change ....

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Ok here more info ...I upload the code.....If  you see is in a timer. When i run it it start to pop up the notification ballons that i great.But after i click to close notification icon it continues to pop up the balloon. And my question is how i can great a repeatedly check of the label and only if the (If) in the code match then pop up the message..