LINQ

here u can get all solution for language intergated query

http://weblogs.asp.net/scottgu/archive/2006/05/14/Using-LINQ-with-ASP.NET-_2800_Part-1_2900_.aspx

learn all technologies here

http://aspalliance.com/922_Using_LINQ_with_ASPNET_Part_1.all

http://en.csharp-online.net/Introducing_LINQ%E2%80%94How_It_Works_4

best
http://www.dotnetcurry.com/ShowArticle.aspx?ID=240&AspxAutoDetectCookieSupport=1

learn webservice/wcf
http://msmvps.com/blogs/abu/archive/2008/11/14/wcf-tutorial-and-ppt-presentation.aspx

learn ajax control toolkit

http://www.asp.net/AJAX/AjaxControlToolkit/Samples/PasswordStrength/PasswordStrength.aspx

http://www.asp.net/LEARN/Ajax-Control-Toolkit/tutorial-34-cs.aspx

http://programming.top54u.com/post/ASP-Net-AJAX-Password-Strength-Extender-Control.aspx

using ajax updateprogress control

update progress control help asp.net programmer to see that progress is going on, it has progresstemplate in it we can wrtie any text like updating... or can apllying any image like running wheel etc
to see examples of images that can be used in progress template visit these sites
http://www.ajaxload.info/
http://mentalized.net/activity-indicators/