http://msdn.microsoft.com/en-us/magazine/cc163499.aspx

Load data in gridview cell asynchronously

http://www.dotnetcurry.com/ShowArticle.aspx?ID=193&AspxAutoDetectCookieSupport=1

Many web applications have online forms that are open for users to submit their information. They are presented by companies for feedback or collectiong information from their customers.

But results in Programs that generate spam, but just submitting information that would clog any database and stats.

Some examples are:

1. Feedback/comments form

2. Registration

3. Login etc.

A CAPTCHA is a program that can identify whether its user is a human or a automated program that runs of a PC. You’ve probably seen images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from “spammers” or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot cause performance issues to sites protected by CAPTCHAs.

Some useful controls are here:

http://subkismet.codeplex.com/

http://www.sharppieces.com/free-aspnet-controls/CaptchaImage.aspx¼/p>

Today a strange error occured on Google. Most of the keywords failed the search and gave a virus check error.

Interestingly a search on “ASP.net” returned results.

But a search on “google” returned the page below.

When I add a new class to the App_code folder VS2008 seems to completely ignore it. It cannot access existsing classes within the project in the new class and this new class cannot be accessed by other web.aspx.cs files.

It doesn’t compile it as part of the project and intellisense doesn’t work.

The solution still compiles and the existing classes are working fine.

Solution:

For some reason when a new file does get added to the App_Code folder, VS2008 defaults the build Action to “Content”.

Right click on the file –> properties –> change build action to “Compile”.

When working on a web site asp.net 3.5 extensions on Win2003 server the SessionManager that was used, use to lose its state between page submits.

The interesting thing was it worked well with IE6 and Firefox for the same Web Application, but failed to retain state in IE7. Some blogs suggested that IE7 loses the state if there is an asp:Image or asp:ImageButton(that gets rendered on the client as an HTML img)  that has a null source or cannot find the image on the server.

But the real problem was that IE7 does not like servernames with an “_” (underscore). This causes the data to get lost. After renaming the server and removing all “_” the session maintained it state.