Prüfen, ob ein String einen Integer enthält

Dim childAgeAsInt As Integer
If Integer.TryParse(childAge, childAgeAsInt) Then
    ' childAge successfully parsed as Integer
Else
    ' childAge is not an Integer
End I

Quelle: https://stackoverflow.com/questions/13980538/check-if-a-string-variable-has-an-integer-value