ASP.Net and callbacks

You can use ASP.NET to run scheduled jobs...First we need something in ASP.NET that is continuously running and gives us a callback. The web server IIS is continuously running. So, we somehow need to get a frequent callback from it so that we can lookup a job queue and see if there’s something that needs to be executed. Now, there are several ways a web server comes to us: * When a page hits * When an application starts * When an application stops * When a session starts and ends/timeouts * When a cache item expires The page hit is random. If no body visits your website for hours, you can’t do the pending jobs for hours. Besides, the execution of a request is very short and needs to finish as soon as possible. If you plan to execute scheduled jobs on page execution, then the page will take longer to execute which will result in a poor user experience. So, clearly this is not an option. When an application starts, we get a callback in the Application_Start method of Global.asax. So, this is a good place to start a background thread which runs forever and executes the scheduled jobs. However, the thread can be killed anytime the web server decides to take a nap due to zero load. When an application stops, we get a callback at Application_End. But we can’t do anything here because the whole application is going to die soon. Session_Start in Global.asax is triggered when a user visits a page that requires a new session to be initiated. So, this is also random. We need something that consistently and periodically fires. A cache item expires on a given time or duration. In ASP.NET, you can add entries in the Cache and set an absolute expiry date time or you can set a duration after which the item is removed from the cache. You can do this by utilizing the following method of the Cache class

---

Sample ASP.net 2.0' Client callback - ASP.NET Forums
Hi I am new to asp 2.0 i am looking for sample code in Vb that demonstrates client Call back in asp 2.0. Also i am looking for RichTexBox control in asp 2.0 nothing fancy just a ...
more ...
go to website
Cached

ASP.NET CallBack - AJAX Wrapper Control by ComponentArt
Clean and Elegant: Acts as a universal AJAX container for any ASP.NET content, allowing a whole new class of rich, high-performing web applications. Superior User Experience: ...
more ...
go to website
Cached

CodeProject: Implement Script Callback Framework in ASP.NET 1.x. Free ...
It allows calls to server events from client script code without causing the page to post back and refresh.; Author: Elvin Cheng; Section: ASP.NET; Chapter: Web Development
more ...
go to website
Cached

ASP.NET callback control - KCallback.net
DimpleSoftware is a leading vendor of ASP.NET components, offering high quality software products and services. Let clients can accelerate .net development. Upload file onto your ...
more ...
go to website
Cached

ASP.NET 2.0's Client Callback Feature
One of the most overlooked features of ASP.NET 2.0, part of Visual Studio 2005 or "Whidbey", is the Client Callback feature. This feature allows you to programmatically ...
more ...
go to website
SearchTags: search.topictype:("kbArticle"; kbarticle), search.program:("Codezone"; codezone), search.publishdate:("5/4/2004 12:00:00 AM"; 5; 4; 2004; 12; 00; 00; am), search.reviseddate:("5/14/2004 4:12:32 PM"; 5; 14; 2004; 4; 12; 32; pm), search.userrating:("90 %"; 90)
SearchTagsArray (Length 22)

SearchTagsArray[0] Name: search.topictype
SearchTagsArray[0] Value: "kbArticle"
SearchTagsArray[1] Name: search.topictype
SearchTagsArray[1] Value: kbarticle
SearchTagsArray[2] Name: search.program
SearchTagsArray[2] Value: "Codezone"
SearchTagsArray[3] Name: search.program
SearchTagsArray[3] Value: codezone
SearchTagsArray[4] Name: search.publishdate
SearchTagsArray[4] Value: "5/4/2004 12:00:00 AM"
SearchTagsArray[5] Name: search.publishdate
SearchTagsArray[5] Value: 5
SearchTagsArray[6] Name: search.publishdate
SearchTagsArray[6] Value: 4
SearchTagsArray[7] Name: search.publishdate
SearchTagsArray[7] Value: 2004
SearchTagsArray[8] Name: search.publishdate
SearchTagsArray[8] Value: 12
SearchTagsArray[9] Name: search.publishdate
SearchTagsArray[9] Value: 00
SearchTagsArray[10] Name: search.publishdate
SearchTagsArray[10] Value: 00
SearchTagsArray[11] Name: search.publishdate
SearchTagsArray[11] Value: am
SearchTagsArray[12] Name: search.reviseddate
SearchTagsArray[12] Value: "5/14/2004 4:12:32 PM"
SearchTagsArray[13] Name: search.reviseddate
SearchTagsArray[13] Value: 5
SearchTagsArray[14] Name: search.reviseddate
SearchTagsArray[14] Value: 14
SearchTagsArray[15] Name: search.reviseddate
SearchTagsArray[15] Value: 2004
SearchTagsArray[16] Name: search.reviseddate
SearchTagsArray[16] Value: 4
SearchTagsArray[17] Name: search.reviseddate
SearchTagsArray[17] Value: 12
SearchTagsArray[18] Name: search.reviseddate
SearchTagsArray[18] Value: 32
SearchTagsArray[19] Name: search.reviseddate
SearchTagsArray[19] Value: pm
SearchTagsArray[20] Name: search.userrating
SearchTagsArray[20] Value: "90 %"
SearchTagsArray[21] Name: search.userrating
SearchTagsArray[21] Value: 90
Cached

---

Optimize ASP.NET Performance
In ASP.NET 2.0, you can use client-side code and callbacks to avoid posting the whole page back to the server for processing (see Additional Resources). A client-side callback lets you send only the data you need back to the server and then retrieve ...
more ...
go to website
Source: VisualStudio Magazine
NewsDateTime: 9/8/2008


hugs

---

Videos from YouTube
Title: ASP.NET 2.0 Nested GridView
Categories: Screencast,Simple,Gridview,2.0,Example,Howto,Nested,Sample,ASP.NET,

Published on: 2/22/2007 10:55:45 AM
Title: Data Access in the ASP.NET 2.0 Framework
Categories: 2.0,Walther,Data,Framework,Stephen,Howto,the,Access,Windows,Programming,in,ASP.NET,

Published on: 10/25/2007 7:32:57 PM
Title: ASP.Net (VB.Net) Session Variable ArrayList - Shalvin
Categories: Tech,VB.Net,Shalvin,.Net,Session,ArrayList,Microsoft,Variable,

Published on: 2/2/2008 10:58:58 PM
Title: asp asp.net programacion tutorial master pages c#
Categories: c#,video,pages,asp.net,Film,master,tutorial,asp,programacion,

Published on: 11/3/2006 8:19:39 AM
Title: AJAX Y ASP.NET
Categories: Howto,AJAX,ASP.NET,

Published on: 5/26/2007 2:39:34 PM