Datacheck Solutions :: ASP

Tutorials
Back

Error Handling

Error Handling

No matter how good a programmer you are you will undoubtedly make mistakes in your code, so its good programming to write code to cope with this eventuality.You can easily trap and turn nasty error messages into easy on the eye messages that the user can understand.

<%
If Err.number <> 0 then     'if there is an error 
response.write Err.number     'write out the error number
response.write Err.source     'write out the error source
response.write Err.description     'write out the error description
End If 
%>

Here's a version of the above HTML formatted;

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

The above code is a simple way to deal with an error.

Another way to deal with an error is to use 'On Error Resume Next' without the quotes
This four word combination is used to tell the server to resume the next line of code if it stumbles upon an error.

"On Error Resume Next" is usually placed at the top of each page.

Example;

<%
On Error Resume Next
respons.write ("there is an error here as response is spelt respons")

If Err.number <> 0 then 
response.write Err.description 
End If 
%>

Even though the code has come across an error there will be no ugly error message displayed and the execution of the code will continue.As there is an error the description will be written out.