>At the very least throw on any exception except the expected one If, for example, you are expecting a DirectoryNotFound exception:

Try
>Catch loError As DirectoryNotFoundException
>  ' Ignore this error
>End Try
>'Other exceptions will be caught by higher level handler

If there's some condition you can check in the Catch to further verify that the exception is the expected one then check that and if it's not as expected then throw again. Also if you can narrow down the line that throws the exception then only put that in the Try block.

Thanks