Error Handling in VB Script

To avoid application may get system failure or Crash, we can use the Error Handling in VB Script



-> On Error Resume Next   (if we want bypass the error, we can use this statement)

-> On Error goto 0     (Deactivate On error Resume Next)

-> Error objects (Err) has

    -> Description Property  (while running we get error description. err.Description())
    -> HelpContext Property
    -> Helpfile Property    (When error occurred we go for help file content using this property)
    -> Number Property   ( Its throw error number)
    -> Source Property   (from where this error occurred)

  Methods are
    -> Clear Method ( Its automatiocally invoked while end of function)
    -> Raise Metod  (used for user defined method)





Programming Script
------------------
1)

On Error Resume Next

Dim a,b

a=12

b 9

msgbox a+b


o/p   12

The above script we have Error (b 9), but "on Error Resume next" bypass the error and move to next statement.


2)

On Error Resume Next

Dim a,b

a=12

b 9

msgbox a+b

on Error goto 0

b 9


o/p  12   and show error too

The above script deactivate the "on error resume next" uding "on error goto 0" statement.



3)

On Error Resume Next

Dim a,b

a=12

b 9

msgbox a+b

msgbox "Error Source = " &err.source
msgbox "Error Description =" &err.Description
msgbox "Error Number = " &err.Number
msgbox "" &err.Clear



o/p
 12 
Error Source = Microsoft VBscript Runtime error
Error Description = Wrong number of arguments or invalid property assignment
Error Number = 450