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SetDataOptions.NoOverwrite: This is quite powerful but dangerous. Using this option, you promise your graphics card that the part of the VertexBuffer you re going to overwrite is currently not being used to render from. Therefore, you can overwrite a specific section of your VertexBuffer, while your graphics card doesn t have to wait for the copying to be finished, because it doesn t need that specific part to do its job. This is faster than the Discard option, because you do not need to reserve a new section of memory.
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By subclassing BusinessBase, all of these objects gain the full set of business object capabilities implemented in s 3 through 5. The model also includes objects that are collections of business objects, and they should inherit from BusinessListBase, as shown in Figure 6-12.
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Throughout the text, I have used the WriteLine method to display values. Each time, I used the simple substitution marker consisting of curly braces surrounding an integer. Many times, however, you will want to present the output of a text string in a format more appropriate than just a plain number. For example, you might want to display a value as currency, or as a fixedpoint value with a certain number of decimal places. You can do this by using format strings. For example, the following code consists of two statements that print out the value 500. The first line prints out the number without any additional formatting. In the second line, the format string specifies that the number should be formatted as currency. Console.WriteLine("The value: {0}." , 500); Console.WriteLine("The value: {0:C}.", 500); Format as currency. This code produces the following output. The value: 500. The value: $500.00. The difference between the two statements is that the format item includes additional information in the form of a format specifier. The syntax for a format specifier consists of three fields inside the set of curly braces: the index, the alignment specifier, and the format specifier. The syntax is shown in Figure 23-1. // Print out number. // Format as currency.
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} I enumerate the XElements that are direct descendants of the root node of the XML data the firstlevel elements. From each first-level XElement, I obtain the Name, Color, and StockLevel second-level XElement objects by using the Element method. I create a new XAttribute object using the name and value of each second-level XElement and call the Add method to add it to the first-level XElement. Finally, I have the second-level XElements remove themselves from their first-level parent by calling the Remove method. Compiling and running Listing 29-13 produces the following XML output, which demonstrates that I have converted the elements to attributes: <Fruits> <Fruit Name="Cherry" Color="Red" StockLevel="500" /> <Fruit Name="Apple" Color="Green" StockLevel="230" /> <Fruit Name="Plum" Color="Red" StockLevel="300" /> </Fruits> Press enter to finish There are several methods you can use to manipulate XElements, the most useful of which are described in Table 29-5. Table 29-5. XElement Modification Members
Some objects need to perform actions before they can be safely destroyed; the most common examples are where connections to databases and other servers need to be explicitly closed. The actions you take will depend on your object, but whatever it is you need to do can be included in a destructor. A destructor is a special method that is called after the garbage collector has identified an object as being unused but before it is deleted from memory. Listing 18-2 contains a class with a destructor. Listing 18-2. Defining a Class Destructor using System; class MyClass { public MyClass() { // constructor statements Console.WriteLine("Constructor called"); } ~MyClass() { // destructor statements Console.WriteLine("Destructor called"); } } A class destructor is a special method that is named after the class that it destructs, prepended with a tilde character (~), as illustrated by Figure 18-1.
Custom authentication means that you are responsible for getting the user s credentials (often a username and password) and ensuring they are valid. The most common way to check the credentials is by comparing them to values in a database table. People also use the ASP.NET MembershipProvider
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The theoretical advantage of the first approach is that to move from database to database you need not change anything. I call it a theoretical advantage because the downside of this implementation is so huge that it makes this solution totally infeasible. What you d have to do to develop a totally databaseindependent process is to create a table such as ops$tkyte%ORA11GR2> create table id_table 2 ( id_name varchar2(30) primary key, 3 id_value number ); Table created. ops$tkyte%ORA11GR2> insert into id_table values ( "MY_KEY", 0 ); 1 row created. ops$tkyte%ORA11GR2> commit; Commit complete. Then, in order to get a new key, you d have to execute the following code: ops$tkyte%ORA11GR2> update id_table 2 set id_value = id_value+1 3 where id_name = "MY_KEY"; 1 row updated. ops$tkyte%ORA11GR2> select id_value 2 from id_table 3 where id_name = "MY_KEY"; ID_VALUE ---------1
There s a related issue too, which is when another user edits the list of roles. That issue is harder to solve, and requires either periodic cache expiration or some mechanism by which the database can notify the client that the roles have changed. Solving this problem is outside the scope of this discussion.
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