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As Example 19-6 shows, the support for optional ref arguments fixes many of the problems that motivated the use of dynamic in 18. C# now offers multiple ways to solve some interop problems, but how should you choose Well, dynamic becomes particularly important when type information lets you down sometimes COM automation APIs don t provide enough type information at compile time, leaving you with properties whose type is nothing more informative than object, at which point, dynamic is usually the best bet. But static typing provides IntelliSense, and can offer better compile-time checks. So it s probably best to stick with static typing until you hit a point where that stops working.

With just one method, we now have many different ways to call it we can provide all the arguments, or just the first and second, or perhaps the first, second, and third. There are many combinations. Before named arguments and defaults were added in C# 4.0, the only way to get this kind of flexibility was to write an overload for each distinct combination.

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As this chapter describes, Microsoft supports standard AJAX idioms and patterns in the ASP .NET framework . However, AJAX is more a style of Web programming involving out-ofband HTTP requests than any specific technology . You ve no doubt seen sites engaging the new interface features and stylings available through AJAX programming . Examples include Microsoft .com, Google .com, and Yahoo .com . Very often while browsing these sites, you ll see modern features such as automatic page updates that do not require you to generate a postback explicitly . Modal-type dialog boxes that require your attention appear until you dismiss them . These are all features available through AJAX-style programming patterns and the ASP .NET extensions (for example, a rich set of AJAX server-side controls and extensions) for supporting AJAX . If you re a long-time Microsoft environment Web developer, you might be asking yourself whether AJAX is something really worthwhile or whether you might be able to get much of the same type of functionality using a tried and true technology such as DHTML .

The password field is removed. Internally, one of the field names has been changed. The values of the name and loginname fields are still visible, but the end user can no longer change them.

The GetEnumerator method in particular ensures that you can walk your way through the records in the view using the familiar foreach statement The following code shows how to access all the rows that fit into the view: DataView myView = new DataView(table); foreach(DataRowView rowview in myView) { // Dereferences the DataRow object DataRow row = rowviewRow; } When client applications access a particular row in the view, the class expects to find it in an internal rows cache If the rows cache is not empty, the specified row is returned to the caller via an intermediate DataRowView object The DataRowView object is a wrapper for the DataRow object that contains the actual data You access row data through the Row property If the rows cache is empty, the DataView class fills it with an array of DataRowView objects, each of which references an original DataRow object.

days = daysPerMonth( month-1, LeapYearIndex() )

public class MyClass2 { // MyClass2's implementation public pointcut desiredCharacteristicJoinPoints() :

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An ASP.NET AJAX-enabled control (or an Ajax-enabled control, as we ll call it) is an ASP.NET server control. It s associated with one or more client components that add client functionality to the markup code it renders. Usually, an Ajax-enabled control renders, in the page, some HTML code and one or more $create statements, depending on the client components it wants to instantiate. The Ajaxenabled control also takes care of loading the necessary script files in the page. The problem of how to programmatically generate a $create statement without relying on hard-coded strings has been solved with the introduction of script descriptors. The ScriptReference object lets you programmatically reference a

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