IsNumeric function
IsNumeric( v )
Returns a TRUE or FALSE indicating if the v parameter can be converted to a numeric data type.
The parameter v can be any variant, numeric value, Date or string (if the string can be interpreted as a numeric).
Example
Sub Form_Click()
   Dim TestVar   ' Declare variable.
   TestVar = InputBox("Please enter a number, letter, or symbol.")
   If IsNumeric(TestVar) Then   ' Evaluate variable.
       MsgBox "Entered data is numeric."   ' Message if number.
   Else
       MsgBox "Entered data is not numeric."   ' Message if not.
   End If
End Sub