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Trace through the events that occur when an Update panel is used. From your MSDN lookup, "The difference is in how the postback is implemented". Postback is not eliminated, just modified. On the other hand a direct AJAX call skips it all.
Using PageMethod is essentially creating a web service that is hosted by the page and thus skips all the overhead assocaited with UpdatePanel.
I know the language. I've read a book. - _Madmatt
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Mark Nischalke wrote: The difference is in how the postback is implemented".
An update panel does "a direct AJAX call".
(how can an indirect call be made ?
)
Check and see if updating an update panel
calls isPostBack.
Mark Nischalke wrote: On the other hand a direct AJAX call skips it all.
In order for an ajax call to have an effect on
the web page you will have to impliment in your
own code that which was "skipped".
PostBack is a microsoft invented term which can
mean a regular http post request like you would
submit to an aspx page or a webservice, it can
also mean a direct ajax call.
Definition of postback from webopedia ...
A mechanism introduced in the Microsoft ASP.NET to allow the communication between client side and server side.
Mark Nischalke wrote: Postback is not eliminated, just modified.
Here we see that by definition a direct ajax call
is cetainly a "postback" which is not eleminated
by direct ajax call , just modified.
At the bottom of this top heavy pyramid is the
XmlHttpRequest object or its activex equivelant.
It is used by update panel and by direct ajax
call.
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Don't understand what points you are trying to make. We'll just leave it as a misunderstanding in terminology and processes.
I know the language. I've read a book. - _Madmatt
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Mark Nischalke wrote: Don't understand what points you are trying to make. We'll just leave it as a misunderstanding in terminology and processes.
I will be more than happy to clear up any
misunderstandibgs you may have 
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Thanks! Seems perfect.
Strive to be humble enough to take advice, and confident enough to do something about it.
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I am a little bit confused; please share your experiences with me.
I need to design a portal for internet users. This portal is going to interact with tow other
Databases that located in tow different servers, one is sql2005 and the other one is mySql,
So I need to update, insert, delete, select most of the time and I need lots of security.
What’s the best way to interact with these tow databases?
Using the web Services or make a connection directly to the servers.
But I think web services act so slowly than making a direct connection to the servers. But in case of security, web services are more secure.
What’s your idea? Is there any other way?
-------
Arlen.N
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Either way can be secure or insecure depending on configuration and usage.
A webservice will allow for a more distributed architecture. Again, depending on configuration and usage it is neither faster or slower than a direct connection.
I know the language. I've read a book. - _Madmatt
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I implemented custom membership provider by deriving from MembershipProvider class. I added login control to my web page and associated my membership provider with my custom database, where I`m keeping all users. This works great.
Whats more, I would like to enable 'Change password' scenario by using the standard ASP.NET control. I created dedicated web page for it and put this control onto form. When I`m willing to change my password (after I logged in to my web application), GetUser(string username, bool) method is being called from my custom membership provider. It`s cool, but why I`m getting my OS login name instead of the login which I used to log onto my web site? In other words: assume that I logged into my web application with {user: User1, password: qwert} credentials. I expect that GetUser method will pass 'User1' as a first argument. Currently it passes '[domainName]/[WindowsLoginName]'.
I believe there is some magical switch in IIS (I`m using v7.5) or web.config file. Could you please help me?
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Have you set the web.config to use your custom implementation or is it still the default provider?
I know the language. I've read a book. - _Madmatt
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It is using my custom implementation - otherwise loggin feature would not work
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Hi, all,
I use Asp.net 2.0.
I create a ImageButton in a gridview row with category ID, when click it I will call function to show or hide all the rows with the same category ID, everything works fine. But the problem is that every time the button is click, the postback is called, how can I stop that? or have any better way to achieve my purpose,
Thanks a lot.
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Are you calling a javascript function to show hide the rows, if yyes just return fasle from that javascript function
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Hi, Brij.
Thank you for your reply.
When click button I call a function in .cs file. Can I avlid postback if use this way?
I also search internet and try to user javascript to solve it, but failed. To access gridview row information like the following, I put it in block.
But this doesn't work, get error "Object Required" in line: rows = document.getElementById(gridName).rows;
also ask a silly question, since the javascript block is inside <head runat = "server"> </head>, it will executed in server side or client side?
Thanks
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Itll be better if you use updatepanel then your posstback wont occur only your grid will be updated.
And how to use updatepanel Have a look
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Hi, Brij,
I got an error "Unknown server tag 'asp:ScriptManager'.", what should I do to use it?
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If you are visual studio 2005, then you need to install Ajaxextentions, Download from here
Then a new template would be added in vs2005, that is ASP.NETAjaxEnabledWebsite create website of that template and it;ll work.
In vs2008 or later it is not required.
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Brij,
Yes, I work on VS2005.
Since I am new to Asp.net, is there any simple way to achieve my purpose instead of AJAX?
Thanks!
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What you can do, you can use Template Field to place ImageButton With in a AJAX Update Panel.
Cheers !
Abhijit Jana | MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.
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Thanks,
I am new to Asp.net, if I use Ajax, do I need to import some new library or third party tool? Basically it
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use Ajax update panel and place your Image button in it.. 
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I also curious why I cannot use javascript to achieve it. I find some codes by using javascript, but when I try it, doesn't work.
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Hi,
As far i know, You want to show the Master/Detail Grid view. ie, if u click the [more] button (imagebutton), u want to show the detailed/ sub grid. if i caught you correct, let me know, so that i can give u a gud solution.
http://www.progtalk.com/viewarticle.aspx?articleid=54
http://www.giswiz.com/nested_gridview_dropdown/Default.aspx
cheers,
Sam
modified on Thursday, April 22, 2010 3:45 AM
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Sam,
Yes, you are right. I alreay solve my question by using javascript to show/hide group rows in gridview.
I have another question, why the grid always has one more empty row as last row of the gridview grid, how can I avoid it?
Thanks!
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Same,
just like the example in the link you reply, if I expend two category, and keep other collapse, after I click sort button, I still want to keep these two category expend, how can I do that? Do you have any example to this case?
Thanks!
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