Software Blog: Ajax

This post is for anyone who is encountering the following errors in their asp.net applications:

• The server tag 'asp:ScriptManager' is ambiguous. Please modify the associated registration that is causing ambiguity and pick a new tag prefix.
• The base class includes the field 'ScriptManager1', but its type (System.Web.UI.ScriptManager) is not compatible with the type of control (System.Web.UI.ScriptManager).

There are many instances where you might exprience this problem. For me, the situation was that we had a virtual directory running asp.net 2.0 with AJAX extensions, while the root site is running asp.net 3.5. The subdirectory was attempting to reference the old 1.0.61025.0 ...

In part 1 and part 2 of this series, I discussed how to create a simple News Rotator for Sitefinity. Everything is working great until you try to visit the page with Javascript disabled. Since we're using link buttons that navigate through the various news items, they require the __dopostback javascript command to initiate the postback to the server and update the news content. Obviously, disabling Javascript will break our functionality.

Incidentally, this is also another reason why I decided to build my own rotator in place of the RadRotator control. Remember that this control loads all of the ...

In my last entry (AJAX News Rotator Part I), I described how I used the NewsManager in Sitefinity to create an AJAX news rotator that dynamically fetches news content using AJAX. Using the linkbuttons in the repeater, users can jump to different items in the list. However, this isn't exactly a "rotator", because to me that implies some sort of automation, which sounds like a good job for the ASP.NET Timer control.

Since most of the logic to retrieve and update the news panel is already built, I only needed a way to automate the transition from item ...

I've recently been developing a control to display recent news in a rotating fashion. Originally, I was using the RadRotator control from Telerik. This is a powerful control that takes a lot of the guesswork out of displaying and rotating news. However, I decided to build my own for two reasons.

First, I didn't like the way the rotator control loads ALL of the news items before running. The RadRotator works by preloading all of the elements, placing each item into its own div element, then cycling through each, toggling visibility of each one at a time. This solution works ...