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If your requirements aren t met by the out-of-the-box uses described previously, you may think that you ll end up using ADO.NET to access your data source, but the Business Data Catalog object model is also an attractive alternative. Imagine the scenario: you have customer data in SQL Server and order data in Oracle. If your developers were to try marrying this data together, they d need to learn and understand how to connect to and access both SQL Server and Oracle and figure out all the nuisances and tricks of each. But if you define both data sources as a Business Data Catalog data source, your developers would only need to learn a single method of getting to data the BDC way! The great thing about this is, no matter what type of data source you re using (SAP, MySQL, Informix, and so forth), you can use exactly the same code and things you ve learned, without having to learn the ins and outs of SAP BAPIs (Phew!). If you want to delve straight into some code, make sure you check out chapter 8, which demonstrates two good examples of a custom application using the Business Data Catalog object model. Before we tell you how to set up your Business Data Catalog connections, we ll dig into the underlying architecture of how the BDC works and where it sits within SharePoint.

We ve discussed at length the nature of the relationship between the widget identifier and the widget data as defined and managed in the SiteMonitorModel class. There are a number of places in the application where a widget identifier is available and the code needs to check for the presence of legitimate data. One example of this is the

One way to understand the difference between a class and an instance (object) is to consider the distinction between the type int and a variable of type int. You can t assign a value to a type:

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Let s look at the numbered sections of this code in a little more detail The Tag property contains an object to associate with the control This provides a general mechanism for associating any data with any control In our case, we use this property to hold the DisplayValEnum enumeration value corresponding to the individual buttons Visual Studio suspends the layout logic for all container controls during initialization, including our group box This ensures that the controls do not perform any layout of their contained objects during initialization As we saw for our Panel control previously, the contained controls, in this case the three radio buttons, are added directly to the GroupBox control This means that layout-related values, such as the Anchor and Dock properties, apply within the GroupBox container, and not within the Form.

.NET types can be divided into value types and reference types. In table 2.1, we see that the built-in types, with the exception of string and object, are value types. Typically, value types are the simple types such as int, long, and char, which are common to most programming languages. Objects, strings, and arrays are examples of reference types:

C# 3.0 added query expressions to the language these look superficially similar to SQL queries in some respects, but they do not necessarily involve a database. For example, we could use the data returned by the GetAllFilesInDirectory code from the preceding chapter, reproduced here in Example 8-1. This returns an IEnumera ble<string> containing the filenames of all the files found by recursively searching the

The Click handler for our three radio buttons is set using the standard += notation for events It is interesting to note that the form itself only contains two controls so far These are the Panel control and the GroupBox control The shared click handler, DisplayOption_Click, receives a radio button object and records its Tag value as the currently selected radio button We will use this selected value to save the settings for our dialog box when the user clicks OK Also note the use of the C# as keyword in our shared click handler An as statement works much like a cast, except that the value null is assigned if the provided variable is not of the given type, as opposed to the InvalidCastException that is thrown when a cast operation fails.

The real Enigma didn t have a paper output. The machines were designed to be carried at the frontline of a battle, and their rotor mechanics and battery were bulky enough without adding a stationery cupboard full of paper and ink ribbons. But we ve moved on a little in the 80-plus years since the Enigma was first developed, and while a 1200 dpi laser printer might be stretching credibility a little too far, we can at least give our emulator a period teletype display. The code is in listing 9.9.

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