<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/3884b76e-a38c-4e51-8040-9455085358fe/C5D3A32A-2E25-4AB0-B8BD-1A5EC3A27D8C/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486" href="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486" style="font-size: 11px;">www.codeproject.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486"><SPAN class="ArticleTopTitle" id="ctl00_ArticleTopHeader_ArticleTitle">Checking Request is Synchronous or Asynchronous in ASP.NET</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486"><P>In case Asp.Net 2.0 and AJAX, when any exception thrown while execution of asynchronous request, it is catched in "<CODE>ScriptManager1_AsyncPostBackError</CODE>" event, then AJAX framework handles that exception and shows java script alert box to user. No event (<CODE>Application_Error</CODE>) from Global.asax file gets fired.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486"><P>But, in Asp.Net 3.5 AJAX they changed exception handling mechanism and now both events "<CODE>ScriptManager1_AsyncPostBackError</CODE>" and <CODE>Application_Error </CODE>from Global.asax gets fired.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486"><P><EM>Issue</EM>: Now, if exception occurs in case of asynchronous request, application tries to redirect user to generic error page instead of showing JavaScript alert and ends up in another exception as <CODE>Redirect </CODE>is not allowed in asynchronous request. <EM>Ha.... exception within Application_Error method</EM> ;).</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.codeproject.com/script/Articles/Article.aspx?aid=28486"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.codeproject.com/img/2D90D022-81E1-42D0-95B8-F113DAB23CA9" alt="image" /></div></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/C5D3A32A-2E25-4AB0-B8BD-1A5EC3A27D8C/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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