Error: "Unable to get property 'UI' of undefined or null reference" when using ModalPopupExtender

I was using below code combination for opening model popup control, while run time I got this error.

asp:ScriptManager
asp:ModalPopupExtender

To resolve this error I just replaced "asp:ScriptManager" tag with "asp:ToolkitScriptManager" and it's works for me.

asp:ToolkitScriptManager
asp:ModalPopupExtender

HTML 5 Offline Support (Manifest) and Local Storage example with Visual Studio

HTML 5 Offline Support (Manifest) and Local Storage example with Visual Studio

HTML5 storage enables a site to work offline and ability to provide a local cache for data on the server but not subject to frequent change.

HTML5 storage supports two types of storages LocalStorage and SessionStorage. First is designed as a long-term storage mechanism for data that spans sessions and time and second is only persistent for the life of a particular user session.

LocalStorage is great for relatively static files or database tables, to increase performance especially when offline versions of the data needed.

You can download your required pages when you are online. If network connectivity goes off, HTML 5 offline application will automatically serves the offline web pages which you have downloaded when you were online.

Browser Supports for Offline and Local Storage:              

• IE (8.0+)
• FIREFOX (3.5+)
• SAFARI (4+)     
• CHROME (4+)
• OPERA (10.5+)
• IPHONE (2.0+)
• ANDROID (2.0+)

Manifest file items:

• JavaScript
• Web pages
• CSS
• Images
• etc.

Manifest files sections:

• CACHE
• NETWORK
• FALLBACK

CACHE section: Declare files to be cached. Files will be served from the cache, even if application is online.
NETWORK section: Declare files that browser should try to download from the server, regardless of whether the user is online or offline.
FALLBACK section: Define fallback resources to be used when the application is offline.

Storage Capacity: 5 MB

Consolidate links to learn Offline and local storage features of HTML 5:

• Good reasons to use HTML 5
• http://tympanus.net/codrops/2011/11/24/top-10-reasons-to-use-html5-right-now/
• Check whether network is On-Line or Off-Line
• http://www.c-sharpcorner.com/uploadfile/75a48f/online-and-offline-events/
• HTML 5 Offline Support (Manifest) working example
• http://www.devcurry.com/2013/11/html-5-offline-applications_16.html
• HTML 5 Local Storage working example
• http://code.msdn.microsoft.com/Working-with-HTML5-local-b0cbe2ef
• Handling application cache events
• https://www.inkling.com/read/javascript-definitive-guide-david-flanagan-6th/chapter-20/handling-application-cache