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Extract specialized code into a subclass If a class has code that s used by only a subset of its instances, move that specialized code into its own subclass. Combine similar code into a superclass If two subclasses have similar code, combine that code and move it into the superclass.

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if ( i = MIN_ELEMENTS ) ...

Support for inheritance is also available with the Microsoft AJAX Library. This allows a JavaScript class to inherit the properties and methods of a base class. Of course, the inheriting class can also override those properties and methods. This is similar to inheritance in other object-oriented languages. You implement inheritance through the registerClass method discussed earlier by setting the baseType property during registration. This enables single inheritance (similar to how the .NET Framework works). If you want to override a function, you simply redefine it by using the same name in the new class.

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isual Studio 2010 is definitely the best tool for writing and debugging ASP.NET code. When it comes to debugging complex problems in client-side JavaScript,

You ll receive information about creating, handling, and editing different types of graphical objects . The differences between these will affect the tools and techniques you ll use . I must therefore first clarify which graphical objects I ll refer to and how these are to be classified . This main section will then deal with basic information about the general technical handling of these types of objects .

The next step in our tuning process is to drill down to the database/file level. You want to isolate the databases that involve most of the cost. Within the database, you want to drill down to the file type (data/log), as the course of action you take depends on the file type. The tool that allows you to analyze I/O information at the database/file level is a dynamic management function (DMF) called sys.dm_io_virtual_file_stats. The function accepts a database ID and file ID as inputs, and returns I/O information about the input database file. You specify NULLs in both to request information about all databases and all files. Note that in SQL Server 2000 you query a function called ::fn_virtualfilestats, providing it 1 in both parameters to get information about all databases.

A standard numeric format string is a single letter followed by an optional pair of digits called the precision specifier. The purpose of the precision specifier depends on the format string used, and if not provided will default to a setting appropriate for the current system settings. The standard format strings are summarized in Table 8-3. The examples use an overloaded ToString method that takes a format string argument but that does not require an IFormatProvider instance.

SELECT * FROM HR.Employees;

USE testdb; IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; IF OBJECT_ID('dbo.T2', 'U') IS NOT NULL DROP TABLE dbo.T2; CREATE TABLE dbo.T1(col1 INT); INSERT INTO dbo.T1 VALUES(1); CREATE TABLE dbo.T2(col1 INT); INSERT INTO dbo.T2 VALUES(1);

allocation order scan Output: 50, 60, 70, 80

public CoolDownButtonControl() { DefaultStyleKey = typeof(CoolDownButtonControl); } 8. The final step in creating the control is to define a control contract that describes your control. This is required in order for your control to be modified by tools such as Expression Blend. This contract consists of a number of attributes that are placed directly in the control class, as follows. These attributes are used only by tools; they are not used by the runtime.

4 . . Build the project by selecting Build, Build Solution on the main menu . 5 . . Visual Studio should add the PalindromeCheckerRenderedControl to the Toolbox . If not, you can add it manually by right-clicking the Toolbox and clicking Choose Item . Use the Browse button to find the CustomControlLib.DLL assembly, and then select it . Visual Studio loads the new control in the Toolbox .

The compiler is alerting you to the fact that both Phone and BetterPhone offer an EstablishConnection method and that the semantics of both might not be identical; simply recompiling BetterPhone can no longer give the same behavior as it did when using the first version of the Phone type . If CompanyB decides that the EstablishConnection methods are not semantically identical in both types, CompanyB can tell the compiler that the Dial and EstablishConnection method defined in BetterPhone is the correct method to use and that it has no relationship with the EstablishConnection method defined in the Phone base type . CompanyB informs the compiler of this by adding the new keyword to the EstablishConnection method: