How to Avoid ThreadAbortException During Response.Redirect in ASP.NET?

Addressing ThreadAbortException in ASP.NET Redirects

The Issue:

When using Response.Redirect(...) for page redirection in ASP.NET, you might encounter the dreaded "System.Threading.ThreadAbortException" error.

Understanding the Exception:

This exception occurs because Response.Redirect, by default, continues executing the code after the redirect command. The web server then prematurely terminates the request, resulting in the exception.

The Solution: Controlled Redirection

The best way to avoid this is to use the Response.Redirect overload that allows you to control the response ending:

Response.Redirect(url, false);
Context.ApplicationInstance.CompleteRequest();

By setting the endResponse parameter to false, you prevent the immediate termination of the request. Context.ApplicationInstance.CompleteRequest() then explicitly signals to IIS to proceed directly to the EndRequest phase, optimizing performance by avoiding unnecessary code execution after the redirect.

Why this is better:

While simply using Response.Redirect(url, true) might seem like a solution, it can lead to performance issues, as the remaining code on the page still runs (albeit briefly) before the redirect takes effect. The above method offers cleaner, more efficient redirection.

Further Reading:

For a deeper dive into handling edge cases, such as redirects within Application_Error handlers, refer to resources like Thomas Marquardt's blog (link would be inserted here if available).

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