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ISBN-10: 0596510500

ISBN-13: 9780596510503

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The drag-and-drop functionality is provided using a custom-made extender. There are two types of drag behavior that need to be supported: reordering of widgets on the same column and moving a widget from one column to another. NET AJAX framework, then each widget that is an IDragSource can easily be dropped on the columns. The more challenging part is to make widgets switch position within the same column, that is, to reorder them. For example, if you move a widget downward, Architecting the Web Portal and Widgets | 19 the widget that was below the dragged widget will jump up to fill the vacant place.

This interface exposes methods to communicate with the container as well as the services provided by the container. IWidgetHost allows the widget to consume services provided by the framework, including authentication, notification, and state persistence. For example: public interface IWidgetHost { void SaveState(string state); string GetState( ); void Maximize( ); void Minimize( ); void Close( ); bool IsFirstLoad { get; } } The various methods IWidgetHost uses are as follows: SaveState Stores arbitrary data as XML (or any other format), but because the data needs to be serialized in a string format, XML is the preferred choice.

So, the challenge is to select a threshold value that does not bring down your server but also does not limit users using proxy servers. DoS attacks and prevention are covered in detail in the next section. Adding Authentication and Authorization | 37 Preventing Denial-of-Service Attacks Web services are the most attractive target for hackers because even an unsophisticated hacker can bring down a server by repeatedly calling a web service. Ajax web portals are a good target for such DoS attacks because if you just visit the home page repeatedly without preserving a cookie, every hit is producing a new user, a new page setup, and new widgets.

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Building an Asp.net Web 2.0 Portal


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