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declaration in <system.web> and <system.webServer>. You need the former only if your application runs under IIS 6 (Windows Server 2003) or if it runs under IIS 7.x but is configured in classic mode. You need the latter only if your application runs under IIS 7.x in integrated mode. If you have both sections, you enable yourself to use a single web.config file for two distinct deployment scenarios. In this case, the <validation> element is key because it prevents IIS 7.x from strictly parsing the content of the configuration file. Furthermore, as discussed in 3, the <httpHandlers> and <httpModules> sections help in testing handlers and modules within Visual Studio if you re using the embedded ASP.NET Development Server (also known as, Cassini).

Dim item As ListViewItem = lv.Items.Add(fi.Name)

If you invoke the hello.axd URL, you obtain the results shown in Figure 4-1.

The technique discussed here is the quickest and simplest way of putting an HTTP handler to work, but there is more to know about the registration of HTTP handlers and there are many more options to take advantage of. Note It s more common to use the ASHX extension for a handler mapping. The AXD extension

item.SubItems.Add(fi.Length)

is generally reserved for resource handlers that inject embedded content such as images, scripts, and so forth.

item.SubItems.Add(fi.CreationTime)

An HTTP handler is a class and must be compiled to an assembly before you can use it. The assembly must be deployed to the Bin directory of the application. If you plan to make this handler available to all applications, you can copy it to the global assembly cache (GAC). The next step is registering the handler with an individual application or with all the applications running on the Web server. You already saw the script you need to register an HTTP handler. Table 4-2 expands a bit more on the attributes you can set up.

item.SubItems.Add(fi.LastWriteTime)

TABLE 4-2

A dynamic column group is one of the main differentiators between a matrix and a table. Recall that a table has dynamic rows, but a fixed number of columns. Dynamic column groups work like dynamic row groups, but are laid out from left to right across the page instead of from top to bottom. Also, like dynamic rows, both the number of rows and the value displayed as the column header are determined by the dataset. As with row groups, you can nest dynamic columns to create multiple grouping levels for columns.

item.SubItems.Add(fi.LastAccessTime)

A wildcard string, or a single URL, that indicates the resources the handler will work on for example, *.aspx. Specifies a comma-separated class/assembly combination. ASP.NET searches for the assembly DLL first in the application s private Bin directory and then in the system global assembly cache. If this attribute is set to false, ASP.NET loads the assembly with the handler on demand. The default value is true. Indicates the list of the supported HTTP verbs for example, GET, PUT, and POST. The wildcard character (*) is an acceptable value and denotes all verbs.

All attributes except for validate are mandatory. When validate is set to false, ASP.NET delays as much as possible loading the assembly with the HTTP handler. In other words, the assembly will be loaded only when a request for it arrives. ASP.NET will not try to preload the assembly, thus catching earlier any errors or problems with it. Additional attributes are available if you register the handler in <system.webServer>. They are listed in Table 4-3.

This routine paints the rows with alternating background color. (See Figure 16-14.)

TABLE 4-3

Display alternating color for background. Sub PaintAlternatingBackColor(ByVal lv As ListView, _ ByVal color1 As Color, ByVal color2 As Color) For Each item As ListViewItem In lv.Items Set the color for this Item object. If (item.Index Mod 2) = 0 Then item.BackColor = color1 Else item.BackColor = color2 End If Assign same color to all subitems. For Each subitem As ListViewItem.ListViewSubItem In item.SubItems subitem.BackColor = item.BackColor Next Next End Sub