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} This test succeeds because it filters out just the read-only attribute Essentially, the Attributes setting consists (in binary) of a series of ones and zeros, such as 00010011 Each 1 represents an attribute that is present, and each 0 represents an attribute that is not When you use the & operator with an enumerated value, it automatically performs a bitwise and operation, which compares each digit against each digit in the enumerated value For example, if you combine a value of 00100001 (representing an individual file s archive and read-only attributes) with the enumerated value 00000001 (which represents the read-only flag), the resulting value will be 00000001 It will have a 1 only where it can be matched in both values You can then test this resulting value against the FileAttributesReadOnly enumerated value using the equal sign.

Here s the declaration for the GridView control that provides the file list, without the formatting-specific style properties: <asp:GridView ID="gridDirList" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gridDirList_SelectedIndexChanged" GridLines="None" CellPadding="0" CellSpacing="1" DataKeyNames="FullName">

System.Web.dll System.Web.Services.dll System.Xml.dll System.EnterpriseServices.dll System.Web.Mobile.dll

Similar logic allows you to verify that a file does not have a specific attribute: if ((myFileAttributes & FileAttributesReadOnly) =! FileAttributesReadOnly) { .. } When setting an attribute, you must also use bitwise arithmetic In this case, it s needed to ensure that you don t inadvertently wipe out the other attributes that are already set // This adds just the read-only attribute myFileAttributes = myFileAttributes | FileAttributesReadOnly; // This removes just the read-only attribute myFileAttributes = myFileAttributes & ~FileAttributesReadOnly;.

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<Columns> <asp:TemplateField> <ItemTemplate> <img src="folder.jpg" /> </ItemTemplate> </asp:TemplateField> <asp:ButtonField DataTextField="Name" CommandName="Select" HeaderText="Name" /> <asp:BoundField HeaderText="Size" /> <asp:BoundField DataField="LastWriteTime" HeaderText="Last Modified" /> </Columns> </asp:GridView> This grid binds to an array of DirectoryInfo objects and displays the Name, Size, and LastWriteTime properties. In addition, the FullName property is designated as a key field so that you can return the full path after the user clicks one of the directories. You ll also notice that one of the columns doesn t actually display any information that s the BoundColumn for length that displays header text, but it doesn t link to any data field. The GridView for the files follows immediately. Here s the slightly shortened control tag: <asp:GridView ID="gridFileList" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gridFileList_SelectedIndexChanged" GridLines="None" CellPadding="0" CellSpacing="1" DataKeyNames="FullName"> <SelectedRowStyle BackColor="#C0FFFF" /> <Columns> <asp:TemplateField> <ItemTemplate> <img src="file.jpg" /> </ItemTemplate> </asp:TemplateField> <asp:ButtonField DataTextField="Name" CommandName="Select" /> <asp:BoundField DataField="Length" /> <asp:BoundField DataField="LastWriteTime" /> </Columns> </asp:GridView> Note that the GridView for displaying files must define a SelectedRowStyle because it supports file selection. The next step is to write the code that fills these controls. The star of the show is a Private method named ShowDirectoryContents(), which retrieves the contents of the current folder and binds the two GridView controls. Here s the complete code: Private Sub ShowDirectoryContents(ByVal strPath As String) ' Define the current directory. Dim dir As New DirectoryInfo(path) ' Get the DirectoryInfo and FileInfo objects. Dim files As FileInfo() = dir.GetFiles() Dim dirs As DirectoryInfo() = dir.GetDirectories()

If you want to use additional features or a third-party component, you may need to import more assemblies. For example, if you want to use an Oracle database, you need to add a reference to the System.Data.OracleClient.dll assembly. To add a reference, select Website Add Reference. The Add Reference dialog box will appear, with a list of registered .NET assemblies (see Figure 2-16).

Some attributes can t be set programmatically. For example, the Encrypted attributed is set by the operating system only if you are using EFS (Encrypting File System) to encrypt files.

Summary

In the Add Reference dialog box, select the component you want to use. If you want to use a component that isn t listed here, you ll need to click the Browse tab and select the DLL file from the appropriate directory. When you add a reference, Visual Studio modifies the web.config file to indicate that you use this assembly. Here s an example of what you might see after you add a reference to the System.Data.OracleClient.dll file: < xml version="1.0" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <compilation debug="true"> <assemblies> <add assembly="System.Data.OracleClient, Version=2.0.0.0, ..."/> </assemblies> </compilation> <!-- Other settings omitted. --> </system.web> </configuration> 5 explores the web.config file in greater detail. If you add a reference to an assembly that isn t stored in the GAC (global assembly cache), Visual Studio will create a Bin subdirectory in your web application and copy the DLL into that directory. This step isn t required for assemblies in the GAC because they are shared with all the .NET applications on the computer.

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