Try to use a foreach loop for all textboxes as below:
Dim RandomNumberAHigh As Integer = 12
Dim RandomNumberALow As Integer = 1
Dim Random As Integer = 0
For Each txt As Control In Me.Controls
If TypeOf txt Is TextBox Then
txt.Text = Int((RandomNumberAHigh - RandomNumberALow + 1) * Rnd() + RandomNumberALow)
End If
Next
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solved Visual Basic Text Box Array for random number generator