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As you may recall from 6, System.Object.Equals() can be overridden to perform value-based (rather than referenced-based) comparisons between reference types. If you choose to override Equals() (and the often related System.Object.GetHashCode() method), it is trivial to overload the equality operators (== and !=). To illustrate, here is the updated Point type: // This incarnation of Point also overloads the == and != operators. public class Point { ... public override bool Equals(object o) { return o.ToString() == this.ToString(); } public override int GetHashCode() { return this.ToString().GetHashCode(); } // Now let's overload the == and != operators. public static bool operator ==(Point p1, Point p2) { return p1.Equals(p2); } public static bool operator !=(Point p1, Point p2) { return !p1.Equals(p2); } }

If you want to configure the HTML element as a server control so that you can handle events and interact with it in code, you need to right-click it in the web page and select Run As Server Control. This adds the required runat="server" attribute to the control tag. Alternatively, you could switch to source view and type this in on your own.

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Notice how the implementation of operator == and operator != simply makes a call to the overridden Equals() method to get the bulk of the work done. Given this, you can now exercise your Point class as follows: // Make use of the overloaded equality operators. static void Main(string[] args) { ... Console.WriteLine("ptOne == ptTwo : {0}", ptOne == ptTwo); Console.WriteLine("ptOne != ptTwo : {0}", ptOne != ptTwo); Console.ReadLine(); } As you can see, it is quite intuitive to compare two objects using the well-known == and != operators rather than making a call to Object. Equals(). If you do overload the equality operators for a given class, keep in mind that C# demands that if you override the == operator, you must also override the != operator (if you forget, the compiler will let you know).

One convenient way to organize content in a web page is to place it in the different cells of an HTML table using the <table> tag. In previous versions of Visual Studio, the design-time support for this strategy was poor. But in Visual Studio 2005, life gets easier. To try it, drag a table from the HTML tab of the Toolbox. You ll start with a standard 3 3 table, but you can quickly transform it using editing features that more closely resemble a word processor than a programming tool. Here are some of the tricks you ll want to use: To move from one cell to another in the table, press the Tab key or use the arrow keys. The current cell is highlighted with a blue border. Inside each cell you can type static HTML or drag and drop controls from the Toolbox. To add new rows and columns, right-click inside a cell, and choose from one of the many options in the Insert submenu to insert rows, columns, and individual cells. To resize a part of the table, just click and drag. To format a cell, right-click inside it, and choose Style. This shows the same Style Builder dialog box you saw in Figure 2-7. To work with several cells at once, hold down Ctrl while you click each cell. You can then right-click to perform a batch formatting operation. To merge cells (in other words, change two cells into one cell that spans two columns), just select the cells, right-click, and choose Merge. With these conveniences, you might never need to resort to a design tool like Dreamweaver.

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