The best way to handle exceptions in a Masterpage setup

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C#

ASP.NET

Masterpage

, +

I have a website where I want to pass an error code to the user so that QA can look back at the error and figure out what happened. I want to do this without displaying specific error details like the exception message or stack trace to the end user. I wrote the below method that sits inside of the top-level master page for the site and I'm wondering what the best way to call it is if any exception is raised in the application.

The only way to do so that I have thought up of so far is too create try catch blocks in every method in the project but I don't really want to do that.

public void ExceptionHandler(Exception e)
        {
            string s = Guid.NewGuid().ToString();

            try
            {
                throw new Exception(s, e);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                divException.InnerHtml = "An exception has occured, please contact QA for more info.\n Error Code: " + s;
            }
        }

And if, I'm doing this the completely wrong way from the first place feel free to suggest other solutions.