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Working around global.asax at runtime

While this doesn’t classify as great development
practice, sometimes a well tested hotfix toa production site is just the
right thing to solve a client’s problem quickly. In our case, the problem
was too many emails being sent due to ClientScriptExceptions (our own custom
Exception that is thrown when a Javascript onerror event fires in the browser
… yes, we do some tricky stuff with an Image in Javascript to get the message
back to the server). Anyway, the exception is caught in global.asax.cs in
the Application_Error method.

So, how do we override this behavior at
runtime? Change the global.asax to the following:

  1 <%@ Application Codebehind="Global.asax.cs" Inherits="Thycotic.xxx.Web.Global" %>
  2 <script runat="server" language="C#">
  3 protected new void Application_Error(Object sender, EventArgs e)
  4 {
  5 	if (System.Web.HttpContext.Current != null)
  6 	{
  7 		Exception outer = HttpContext.Current.Server.GetLastError();
  8 		Exception inner = outer.InnerException;
  9 		Exception actualException = (inner == null) ? outer : inner;
 10 		if (!(actualException is Thycotic.Foundation.WebControls.ClientScriptException))
 11 		{
 12 			 Thycotic.Foundation.ExceptionManager.HandleApplicationErrorEvent();
 13 		}
 14 	}
 15 }

Voila! Problem fixed without a recompile or binary
redeployment! Unfortunately, we hadn’t marked the original method as
virtual so we had to use “new” on the method signature – something we very
seldom use.

Hope you find this trick useful and never have to
use it! 🙂

Jonathan Cogley isthe CEO and founder of
thycotic, a .NET consulting company and ISV in Washington DC. thycotic has
just released
Thycotic Secret Server which is a secure web-based solution to both “Where is my Hotmail
password?” and “Who has the password for our domain name?”. Secret Server
isthe leader in secret management and sharing within companies and

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