What is the difference between VBScript's + and & operator?

Question

On every site that talks about VBScript, the \'&\' operator is listed as the string concatenation operator. However, in some code that I have recently inher

Answer 1

In some cases the + will throw an exception; for example the following:

Sub SimpleObject_FloatPropertyChanging(fvalue, cancel)
   'fvalue is a floating point number
   MsgBox "Received Event: " + fvalue
End Sub

You will get an exception when the COM object source fires the event - you must do either of the following:

MsgBox "Received Event: " & fvalue

or

MsgBox "Received Event: " + CStr(fvalue)

It may be best in either case to use CStr(value); but using & per above comments for string concatenation is almost always best practice.