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Comparing IE s rendering with Firefox, we only have to make a few margin adjustments on the left and right columns (they are further down the page than they should be), reduce the size of the footer text, and of course correct the background image in the center column. Fixing the margins ends up involving adjustments to multiple rules: the #header receives a shorter negative bottom margin, the padding on top of #navigation ul is reduced, and the top margins of the left and right columns are cut in half. Reducing the size of the footer text is a simple matter of setting a smaller font-size. That leaves the background image behind the link list. Because our design uses a drop shadow around the entire menu, we decided we wanted that to be a transparent PNG so the artwork further in the background would be able to show through. Unfortunately, IE 6 doesn t support 8-bit transparency in PNGs, so we re going to let IE users see an alternate image (a GIF) that doesn t include the shadow. These adjustments can all be placed within an IE conditional comment, targeting IE 6 and earlier:  These IE-specific styles could also be placed in an external style sheet and the style sheet linked within the conditional comment. The final layout looks great across browsers and platforms (Figure 6-11), with no hacks in sight.

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Console.WriteLine("{0} is going {1} MPH", c.PetName, c.CurrSpeed); } } } Sadly, the compiler informs you that the Garage class does not implement a method named GetEnumerator(). This method is formalized by the IEnumerable interface, which is found lurking within the System.Collections namespace. Objects that support this behavior advertise that they are able to expose contained subitems to the caller: // This interface informs the caller // that the object's subitems can be enumerated. public interface IEnumerable { IEnumerator GetEnumerator(); } As you can see, the GetEnumerator() method returns a reference to yet another interface named System.Collections.IEnumerator. This interface provides the infrastructure to allow the caller to traverse the internal objects contained by the IEnumerable-compatible container: // This interface allows the caller // obtain a container's subitems. public interface IEnumerator { bool MoveNext (); // object Current { get;} // void Reset (); // } to

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VB . net : Events for barcode scanner | The ASP.NET Forums
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Advance the internal position of the cursor. Get the current item (read-only property). Reset the cursor before the first member.

If you wish to update the Garage type to support these interfaces, you could take the long road and implement each method manually. While you are certainly free to provide customized versions of GetEnumerator(), MoveNext(), Current, and Reset(), there is a simpler way. As the System.Array type (as well as many other types) already implements IEnumerable and IEnumerator, you can simply delegate the request to the System.Array as follows: using System.Collections; ... public class Garage : IEnumerable { // System.Array already implements IEnumerator! private Car[] carArray; public Garage() { carArray = new Car[4]; carArray[0] = new Car("FeeFee", 200, 0); carArray[1] = new Car("Clunker", 90, 0); carArray[2] = new Car("Zippy", 30, 0); carArray[3] = new Car("Fred", 30, 0); } public IEnumerator GetEnumerator() { // Return the array object's IEnumerator. return carArray.GetEnumerator(); } }

Let s take a look at some of the other tools we can use to make our debugging more efficient. In this section, we ll look at the following: Step-through options The Immediate window The Locals window The Watch window The call stack

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short is {0}.", sizeof(short)); int is {0}.", sizeof(int)); long is {0}.", sizeof(long)); MyValueType is {0}.",

Summary

Like many other languages in the C family, C# supports the use of various symbols that allow you to interact with the compilation process. Before examining various C# preprocessor directives, let s get our terminology correct. The term C# preprocessor directive is not entirely accurate. In reality, this term is used only for consistency with the C and C++ programming languages. In C#, there is no separate preprocessing step. Rather, preprocessing directives are processed as part of the lexical analysis phase of the compiler. In any case, the syntax of the C# preprocessor directives is very similar to that of the other members of the C family, in that the directives are always prefixed with the pound sign (#). Table 9-4 defines some of the more commonly used directives (consult the .NET Framework 2.0 SDK documentation for complete details).

Used to mark sections of collapsible source code Used to define and undefine conditional compilation symbols Used to conditionally skip sections of source code (based on specified compilation symbols)

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