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POIs Response.End() considered harmful?
 

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    <p><a href="http://support.microsoft.com/kb/312629" rel="noreferrer">This KB Article</a> says that ASP.NET's <code>Response.End()</code> aborts a thread. </p> <p>Reflector shows that it looks like this: </p> <pre><code>public void End() { if (this._context.IsInCancellablePeriod) { InternalSecurityPermissions.ControlThread.Assert(); Thread.CurrentThread.Abort(new HttpApplication.CancelModuleException(false)); } else if (!this._flushing) { this.Flush(); this._ended = true; if (this._context.ApplicationInstance != null) { this._context.ApplicationInstance.CompleteRequest(); } } } </code></pre> <p>This seems pretty harsh to me. As the KB article says, any code in the app following <code>Response.End()</code> will not be executed, and that violates the principle of least astonishment. It's almost like <code>Application.Exit()</code> in a WinForms app. The thread abort exception caused by <code>Response.End()</code> is not catchable, so surrounding the code in a <code>try</code>...<code>finally</code> won't satisfy. </p> <p>It makes me wonder if I should always avoid <code>Response.End()</code>.</p> <p>Can anyone suggest, when should I use <code>Response.End()</code>, when <code>Response.Close()</code> and when <code>HttpContext.Current.ApplicationInstance.CompleteRequest()</code>? </p> <p>ref: <a href="http://west-wind.com/weblog/posts/368975.aspx" rel="noreferrer">Rick Strahl's blog entry</a>.</p> <hr> <p>Based on the input I've received, my answer is, <strong>Yes, <code>Response.End</code> is harmful</strong>, but it is useful in some limited cases.</p> <ul> <li>use <code>Response.End()</code> as an uncatchable throw, to immediately terminate the <code>HttpResponse</code> in exceptional conditions. Can be useful during debugging also. <em>Avoid <code>Response.End()</code> to complete routine responses</em>. </li> <li>use <code>Response.Close()</code> to immediately close the connection with the client. Per <a href="http://blogs.msdn.com/b/aspnetue/archive/2010/05/25/response-end-response-close-and-how-customer-feedback-helps-us-improve-msdn-documentation.aspx" rel="noreferrer">this MSDN blog post</a>, this method <em>is not intended for normal HTTP request processing.</em> It’s highly unlikely that you would have a good reason to call this method.</li> <li>use <code>CompleteRequest()</code> to end a normal request. <code>CompleteRequest</code> causes the ASP.NET pipeline to jump ahead to the <code>EndRequest</code> event, after the current <code>HttpApplication</code> event completes. So if you call <code>CompleteRequest</code>, then write something more to the response, the write will be sent to the client. </li> </ul> <hr> <p>Edit - 13 April 2011</p> <p>Further clarity is available here:<br> - <a href="http://blogs.msdn.com/b/aspnetue/archive/2010/05/25/response-end-response-close-and-how-customer-feedback-helps-us-improve-msdn-documentation.aspx" rel="noreferrer">Useful post on MSDN Blog</a><br> - <a href="http://www.c6software.com/codesolutions/dotnet/threadabortexception.aspx" rel="noreferrer">Useful analysis by Jon Reid</a></p>
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