Error Handling

After everything else is done with your new piece of asp code, what about errors? No matter how much time you have spent checking through your code there is still the possibility of a logic error, or maybe someone using your program can induce an error.  System error messages can easily be trapped and turned into something which looks more preplanned and easier on the eye.

To trap errors we add <%on error resume%>at the appropriate place in the code, usually at the start.. I have found before that it has been necessary to place this at the start of a subroutine.

Next after each section of code which is likely to cause an error, for example database connections, add the following:

If Err.number <> 0 then  errorTrap   'if there is an error

And later in the code:

<%
Function errorTrap
    response.write ("Sorry you have encoutered an error."  & "<br>")
    response.write ("Your error number is " & Err.number  & "<br>")
    response.write ("The error source is " & Err.source & "<br>")
    response.write ("The error description is " & Err.description  & "<br>")
End Function
%>