winforms data matrix reader

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In addition to the methods listed in Table 2-3, the XmlReader class also features a couple of static (shared, if you speak only Microsoft Visual Basic) methods named IsName and IsNameToken. Both take a string and return a Boolean value. The return value indicates whether the given string complies with the respective definitions of a Name and a Nmtoken (name token) according to the W3C XML 1.0 Recommendation. In XML 1.0, a Name is a string that begins with a letter, an underscore (_), or a colon (:) and continues with letters, digits, hyphens, underscores, and colons. A Nmtoken, on the other hand, is any non-zero-length mixture of name characters that is, letters, digits, hyphens, underscores, and colons. Note A static member (as opposed to an instance member) of a class is a kind of global member that belongs to the type itself rather than to a specific instance of the class. Whereas an instance of a class contains a separate copy of all instance members, there is only one copy of each static member. Static members can't be referenced through an instance. Instead, you must reference them through the type name: Console.WriteLine(XmlReader.IsName("DinoEsposito")); Members that in C# are called static and declared with the static keyword, in Visual Basic .NET are called shared and are declared with the Shared keyword. Aside from this, their usage is identical.

Select that code and Cut (press Ctrl+X on Windows) those lines. It is always a good idea to use the cut option rather than the delete option when modifying a template. If the change results in some problem for the display, you can simply paste the old text back into the template. If you open a browser window to display your home page, you ll find that the Joomla statement at the bottom is now gone, as shown in Figure 6-10. While the editor in the Administrator interface is good for minor changes to a template, extensive modifications are best performed with a substantial text editor. In the next section, you ll find an overview of the most popular programs that are used for Joomla development and template creation.

Drop the InsideTSQL2008 version so that it doesn t interfere with the following examples:

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you need to create a data source control to map to this class. The ObjectDataSource should pass the value for the city to the method from the query string. In this case, you would create a SelectParameters set that includes a QueryStringParameter definition. The QueryStringParameter definition would map between the name of the query string parameter and the name of the method s parameter. The following code shows an example.

table; instead, it returns a cursor. Remember that SQL is based on set theory. A set doesn t have a predetermined order to its rows: It s a logical collection of members, and the order of the members shouldn t matter. A query with a presentation ORDER BY clause returns an object with rows organized in a particular order. ANSI calls such an object a cursor. Understanding this step is one of the most fundamental steps to correctly understanding SQL.

If an assembly is to be accessed by multiple applications, the assembly must be placed into a well known directory and the CLR must know to look in this directory automatically when a reference to the assembly is detected. This well known location is called the global assembly cache (GAC), which can usually be found in the following directory:

If you re reading this chapter before you buy your server, congratulations on being a thorough person. If not, some of these decisions have already been made, but you may well nd that you will have to add storage. If you do, you ll want to focus on storage solutions designed and optimized for servers a very different set of needs from the typical workstation. Your choices are:

Figure 1-8

As I explained previously, these constructs catch and swallow exceptions that shouldn t be caught and swallowed by a class library. Here s an example: the System.IO.Directory and System.IO.File types have static Exists methods. Both methods return true or false depending on whether the path argument identifies a directory/file that exists on the user s disk drive. If anything goes wrong inside these methods, the methods catch Exception and return false to their caller. The caller has no way to tell whether the exception occurred because the file doesn t exist or whether the caller doesn t have sufficient access to the directory or file. Also, if a StackOverflowException or an OutOfMemoryException is thrown, then false is also returned! The second problem is that Microsoft s FCL code frequently catches an exception and throws a new exception. As explained previously, this can be useful if the new exception provides necessary information, but the FCL often hides what actually happened from the application developer. For example, the System.Array type s Sort method sorts an array of objects by calling each object s CompareTo method. If the CompareTo method throws an exception (any exception), the Sort method catches it and throws a new InvalidOperationException. This is terrible! It means that your code could throw an exception that your code can never catch. There s no reason for Array s Sort method to do this. By the way, Array s BinarySearch method also catches any and all exceptions and throws a new InvalidOperationException, which is equally as troublesome.

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