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Exception Handling in a N tier application visual basic 2015

Last Modified: 2016-02-11
I'm moving from vba to vb.net.
I have a 3 tier application - UI, BLL and DAL.

How is the best way to handle Exceptions?

I Know how to catch and throw them.
I have set up a Centralised Exception handler

At what point should I log the Exceptions?
Where they are thrown or in the UI?
If Where they are thrown then how do the Upper Layers know that the exception has been logged so I don't get duplicates?

It seems far easier to do all the Logging in the UI, This is being done by calling a Shared Sub in the BLL.
Is this Bad Practice?

I am looking to log the exceptions in the database and if that fails (No Connection to Database) then write to a Text file Log.
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