Ho to repeat specific code every n time interval

hi I just wrote a code that imports data of a specific cell from excel file.
now i want to do 2 works to my code here they are:
1.i want the code to be repeated every N minutes. I tried to use the code that i mention here but The app just give me this Error:
Cross-thread operation not valid: Control 'textbox1' accessed from a thread other than the thread it was created on.

2.I want the app that after 10 times of repeating check the output if its the same as the first output stops the loop and show a message box.

I appreciate your helps!

What I have tried:

Public Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim minutes As Double = 0.5
Dim t As New System.Timers.Timer(60000 * minutes)
AddHandler t.Elapsed, AddressOf t_Elapsed
t.Start()
end sub
Private Sub t_Elapsed(sender As Object, e As System.Timers.ElapsedEventArgs)
'here i write my main code to be repeated
end sub

Tags: Visual Basic