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public class Square { public int Length {get; set;} public Square(int l) { Length = l; } public Square(){} public void Draw() { for (int i = 0; i < Length; i++) { for (int j = 0; j < Length; j++) { Console.Write("*"); } Console.WriteLine(); } } public override string ToString() { return string.Format("[Length = {0}]", Length); } // Rectangles can be explicitly converted // into Squares. public static explicit operator Square(Rectangle r) { Square s = new Square(); s.Length = r.Height; return s; } } Notice that this iteration of the Square type defines an explicit conversion operator. Like the process of overloading an operator, conversion routines make use of the C# operator keyword, in conjunction with the explicit or implicit keyword, and must be defined as static. The incoming parameter is the entity you are converting from, while the operator type is the entity you are converting to. In this case, the assumption is that a square (being a geometric pattern in which all sides are of equal length) can be obtained from the height of a rectangle. Thus, you are free to convert a Rectangle into a Square as follows: static void Main(string[] args) { Console.WriteLine("***** Fun with Conversions *****\n"); // Make a Rectangle. Rectangle r = new Rectangle(15, 4); Console.WriteLine(r.ToString()); r.Draw();

The DetailsView is designed to display a single record at a time. It places each piece of information (be it a field or a property) in a separate row of a table.

As you are aware, different languages express the same programming constructs in unique, languagespecific terms. For example, in C# you denote string concatenation using the plus operator (+), while in VB you typically make use of the ampersand (&). Even when two distinct languages express the same programmatic idiom (e.g., a function with no return value), the chances are very good that the syntax will appear quite different on the surface.

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// C# method returning nothing. public void MyMethod() { // Some interesting code... } ' VB method returning nothing. Public Sub MyMethod() ' Some interesting code... End Sub As you have already seen, these minor syntactic variations are inconsequential in the eyes of the .NET runtime, given that the respective compilers (csc.exe or vbc.exe, in this case) emit a similar set of CIL instructions. However, languages can also differ with regard to their overall level of functionality. For example, a .NET language may or may not have a keyword to represent unsigned data, and may or may not support pointer types. Given these possible variations, it would be ideal to have a baseline to which all .NET-aware languages are expected to conform. The CLS is a set of rules that describe in vivid detail the minimal and complete set of features a given .NET-aware compiler must support to produce code that can be hosted by the CLR, while at the same time be accessed in a uniform manner by all languages that target the .NET platform. In many ways, the CLS can be viewed as a subset of the full functionality defined by the CTS. The CLS is ultimately a set of rules that compiler builders must conform to if they intend their products to function seamlessly within the .NET universe. Each rule is assigned a simple name (e.g., CLS Rule 6) and describes how this rule affects those who build the compilers as well as those who (in some way) interact with them. The cr me de la cr me of the CLS is the mighty Rule 1. Rule 1: CLS rules apply only to those parts of a type that are exposed outside the defining assembly.

You saw how to create a basic DetailsView to show the currently selected record in 9. The DetailsView can also bind to a collection of items. In this case, it shows the first item in the group. It also allows you to move from one record to the next using paging controls, if you ve set the AllowPaging property to True. You can configure the paging controls using the PagerStyle and PagerSettings properties in the same way as you tweak the pager for the GridView. The only difference is that there s no support for custom paging, which means the full data source object is always retrieved. Figure 10-17 shows the DetailsView when it s bound to a set of employee records, with full employee information.

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