.net core barcode reader

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The Silverlight/WPF team could have scrapped traditional CLR properties with their get and set accesors and created special Silverlight CLR properties, but they would have broken backwards compatibility and cross-compilation with regular NET objects Instead, the team created dependency properties that back up CLR properties and expose additional functionality This implementation works really well because the Silverlight framework is smart enough to figure out if there is a dependency property backing it up to expose the additional data binding functionality Figure B-18 illustrates this concept visually In this figure, you can see two properties defined On the left is a traditional CLR property with a get and set accessor functions On the right is the same property backed up by additional dependency property syntax What is interesting is that Silverlight is smart enough to understand this and enables data binding.

Triggers are a very useful construct for T-SQL programmers A routine can be defined that will automatically fire upon attempted data manipulation, thereby putting the onus for the required logic on the database itself, rather than every stored procedure that needs to manipulate it An example of this would be a trigger used for auditing By using a trigger, the logic for copying some of the modified data into another table is centralized Without the trigger, every stored procedure that did anything with the data would need to have its own copy of this logic, and a developer might forget to include it in one stored procedure, thereby destroying continuity of the audit logs CLR triggers behave the same way as T-SQL triggers, bringing the same power to the table: centralization and encapsulation of logic However, CLR triggers can be written in a .

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The quota can be increased further by the user through the UI thread, usually as a result of a UI event handler. Otherwise,the quota cannot be increased on a background thread or without user action. Isolated storage remains intact even if the browser cache is cleared, but isolated storage can be manually deleted by the user or application. Applications can request more space by invoking the IsolatedStorageFile.IncreaseQuotaTo() method in response to a user-initiated event, such as a mouse click or key press, as noted previously. To work with isolated storage, first obtain an isolated store for the application using the IsolatedStorageFile. GetUserStoreForApplication method. This returns an IsolatedStorageFile object, which you can use to create directories using the CreateDirectory method and files using the CreateFile method. The CreateFile method returns an IsolatedStorageFileStream object. The IsolatedStorageFileStream class inherits from FileStream, so you can use the class with StreamReader and StreamWriter objects. Another option is to use the IsolatedStorageSettings class, which is a Dictionary object that can be used to quickly store key/value pairs in isolated storage.

NET language and possibly take advantage of resources not easily accessible from T-SQL, such as regular expressions for data validation CLR triggers can be used to define both DML (such as UPDATE, INSERT, and DELETE) and DDL triggers (such as CREATE TABLE) (See 13 for a discussion of DDL triggers) It s important to remember when working with triggers that speed is of the essence A trigger fires in the context of the transaction that manipulated the data Any locks required for that data manipulation are held for the duration of the trigger s lifetime This means that slow triggers can create blocking problems, which can lead to severe performance and scalability issues This concern is doubly important when working with the CLR Triggers are not the place to contact web services, send e-mail, work with the file system, or do other synchronous tasks.

You can see this below each property from the Expression Blend 4 syntax The traditional CLR property cannot leverage data binding or element binding Both options are grayed out However, because the CLR property on the right is backed up by a dependency property, these options automatically become available I am dramatically oversimplifying what is going on behind the scenes However, before proceeding you should understand that dependency property syntax added to traditional CLR properties will enable using the Silverlight data binding framework with all its features..

To test isolated storage, our sample does two things. It allows a user to store and update a setting using the IsolatedStorageSettings class and to save and reload form state between browser sessions. Figure 2-12 shows the UI with a mock form.

Developers who need this functionality should investigate using technologies such as Service Broker, which is discussed in 9 Remember that if you re using CLR triggers, keep them simple!.

Figure B-18. Classic CLR properties will not provide a full data binding experience in Silverlight. Enhancing a CLR property with dependency property syntax will enable the full data binding options in Silverlight. In addition, Expression Blend 4 tools can be used to automate data binding with dependency properties. Dependency properties support element property binding in addition to data binding.

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