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One notable quirk occurs when you use the standard pass-by-value mechanism. In this case, pass-by-value doesn t create a copy of the object, but a copy of the reference. This reference still points to the same in-memory object. This means that if you pass a Product object to a method, for example, the method will be able to alter your Product object, regardless of whether you use pass-by-value or pass-by-reference.

Initializing the Application with init()

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In this example, you ll build on the previous example and allow the user to select the Manufacturer of interest. Once a selection has been made, only the Players for that Manufacturer will be returned. Follow these steps: 1. If you ve closed Select.aspx from the root of the 04 Web site, reopen it. 2. Switch to the Design view of the page and add a DropDownList to the top of the page, above the GridView that is already there. 3. From the DropDownList Tasks menu, check the Enable AutoPostPack option, as shown in Figure 4-4.

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C# also supports a third type of parameter: the output parameter. To use an output parameter, precede the parameter declaration with the keyword out. Output parameters are commonly used as a way to return multiple pieces of information from a single method. When you use output parameters, the calling code can submit an uninitialized variable as a parameter, which is otherwise forbidden. This approach wouldn t be appropriate for the ProcessNumber() method, because it reads the submitted parameter value (and then doubles it). If, on the other hand, the method used the parameter just to return information, you could use the out keyword, as shown here: private void ProcessNumber(int number, out int double, out int triple) { double = number * 2; triple = number * 3; } Remember, output parameters are designed solely for the method to return information to your calling code. In fact, the method won t be allowed to retrieve the value of an out parameter, because it may be uninitialized. The only action the method can take is to set the output parameter. Here s an example of how you can call the revamped ProcessNumber() method: int num = 10; int double, triple; ProcessNumber(num, out double, out triple);

To begin this simple Ajax application, we call the init() function. Listing 5-16 shows the code for init().

Figure 4-4. Enabling the DropDownList to post back automatically 4. Double-click the DropDownList to add the SelectedIndexChanged event. Add the following code (this is pretty much what is in the Page_Load event so you could copy it and modify the bits that are changed to avoid any extra typing): protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString); // build the basic query string strCommandText = "SELECT Player.PlayerName, Manufacturer.ManufacturerName FROM Player INNER JOIN Manufacturer ON Player.PlayerManufacturerID = Manufacturer.ManufacturerID"; // add the filter string filterValue = DropDownList1.SelectedValue; if (filterValue != "0") { strCommandText += " WHERE Player.PlayerManufacturerID = " + filterValue; } // add the ordering strCommandText += " ORDER BY Player.PlayerName"; // create the command SqlCommand myCommand = new SqlCommand(strCommandText, myConnection); // open the database connection myConnection.Open();

So far, the discussion has focused on simple data types and classes. The .NET class library is actually composed of types, which is a catchall term that includes several object-like relatives: Classes: This is the most common type in .NET Framework. Strings and arrays are two examples of .NET classes, although you can easily create your own. Structures: Structures, like classes, can include fields, properties, methods, and events. Unlike classes, they are value types, which alters the way they behave with assignment and comparison operations. Structures also lack some of the more advanced class features (such as inheritance) and are generally simpler and smaller. Integers, dates, and chars are all structures.

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