If you are wondering about viewing errors that occur, here is a nice solution:
ElmahR = ELMAH + SignalR[
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That project uses ELMAH to view unhandled exceptions. This is an easy way to start logging on a site. Beyond that, though, you should be logging exceptions and handling them properly. To do this, I personally recommend using log4net to capture exceptions properly and log them centrally. Here is a tutorial I wrote on how to use log4net:
log4net Tutorial[
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As far as what to do with the errors, the best advice I can give is to fix them. :) Use the error output to identify where the errors are occuring and why they are happening. From there you can figure out how to handle those situations more gracefully.
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