devexpress asp.net barcode control Re-Creating the HybridDictionary Object in vb

Development QRCode in vb Re-Creating the HybridDictionary Object

The next step in our contrived example is to check if seating is available for a specific film showing. We will create a Sequence activity that contains a number of other activities to perform this check.

The way authentication is handled by CSLA .NET is controlled through the configuration file: < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="CslaAuthentication" value="Csla" /> </appSettings> </configuration> The CslaAuthentication key shown here specifies the use of custom authentication. 8 implemented the PTPrincipal and PTIdentity classes specifically to support custom authentication, and the UI code in this chapter will use custom authentication as well. If you want to use Windows authentication, change the configuration to the following: <add key="CslaAuthentication" value="Windows" /> Of course, that change would require coding changes. To start, the PTPrincipal and PTIdentity classes should be removed from ProjectTracker.Library, as they would no longer be needed. Also, the login/logout functionality implemented in this chapter would become unnecessary. Specifically, the Login form and the code to display that form would be removed from the UI project.

It should be quite clear at this point that merging the two collections or their child objects into a single set of objects isn t the right answer. They have different responsibilities, so they should be separate objects. But this leaves one glaring issue: what about the common properties and any common business logic they might require How can two objects use the same data without causing duplication of business logic

Whether editable or read-only, all root objects go through the same basic creation process. (Root objects are those that can be directly retrieved from the database, while child objects are retrieved within the context of a root object, though never directly.) As I discussed in 4, it s up to the root object to invoke methods on its child objects and child collections so that they can load their own data from the database. Usually, the root object actually calls the database and gets all the data back, and then provides that data to the child objects and collections so that they can populate themselves. From a purely object-oriented perspective, it might be ideal to have each object encapsulate the logic to get its own data from the database, but in reality it s not practical to have each object independently contact the database to retrieve one row of data.

When the player is connected to the session, you can store all the data you want to send in a PacketWriter stream. Once this has been done, you can send this PacketWriter to all players in the session using the LocalNetworkPlayer.SendData method. Before receiving any data for a player on the local machine, you should check whether their LocalNetworkGamer.IsDataAvailable flag is set to true, which indicates data has been received and is ready to be processed. As long as this flag is true, you should call the LocalNetworkGamer.ReceiveData method, returning a PacketReader containing all the data another player has sent to the local player.

Summary

Creating amazing iPhone applications is quite a bit more involved than it would seem at first glance. Though many gimmicky applications have made money in the App Store, building an elegant, easy-to-use application that solves a real problem or provides meaningful entertainment is the best way to guarantee long-term success. This chapter explores my journey in founding an iPhone development company and building several well-respected, profitable applications.

Using the EventArgs Class..................................................................................................................401 Passing Data by Extending EventArgs ................................................................................................402 Using the Custom Delegate ................................................................................................................403