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Parses the supplied directory string and tells you what the parent directory is. You could do this on your own by searching for the \ character (or, more generically, the Path.DirectorySeparatorChar), but this function makes life a little easier. Allows you to set and retrieve the current directory, which is useful if you need to use relative paths instead of full paths. Generally, you shouldn t rely on these functions use full paths instead. Accepts two parameters: the source path and the destination path. The directory and all its contents can be moved to any path, as long as it s located on the same drive. Returns a System.Security.AccessControl.DirectorySecurity object. You can use this object to examine the Windows access control lists (ACLs) that are applied on this directory and even change them programmatically.

There s no easy way to jump to a location in a text or binary file without reading through all the information in order. While you can use methods such as Seek() on the underlying stream, you need to specify an offset in bytes. This involves some fairly involved calculations to determine variable sizes. If you need to store a large amount of information and move through it quickly, you need a dedicated database, not a binary file.

This problem has another, equally effective solution. You could create a single GridView but not bind directly to the FileInfo.Length property. Instead, you would bind to a method in the page class that examines the current data object and return either the length (for FileInfo objects) or a blank string (for DirectoryInfo objects). You could construct a similar method to hand out the correct icon URL.

GetCurrentDirectory() and SetCurrentDirectory() Move()

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ASP NET includes two controls that allow website users to upload files to the web server Once the web server receives the posted file data, it s up to your application to examine it, ignore it, or save it to a back-end database or a file on the web server The controls that allow file uploading are HtmlInputFile (an HTML server control) and FileUpload (an ASP NET web control) Both represent the <input type="file"> HTML tag The only real difference is that the FileUpload control takes care of automatically setting the encoding of the form to multipart/ form data If you use the HtmlInputFile control, it s up to you to make this change using the enctype attribute of the <form> tag if you don t, the HtmlInputFile control won t work Declaring the FileUpload control is easy.

Here s the declaration for the GridView control that provides the file list, without the formattingspecific style properties:

GetAccessControl()

It doesn t expose any new properties or events that you can use through the control tag <asp:FileUpload ID="Uploader" runat="server" /> The <input type="file"> tag doesn t give you much choice as far as the user interface is concerned (it s limited to a text box that contains a filename and a Browse button) When the user clicks Browse, the browser presents an Open dialog box and allows the user to choose a file This behavior is hardwired into the browser, and you can t change it Once the user selects a file, the filename is filled into the corresponding text box However, the file isn t uploaded yet that happens later, when the page is posted back At this point, all the data from all the input controls (including the file data) is sent to the server.

<asp:GridView ID="gridDirList" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gridDirList_SelectedIndexChanged" GridLines="None" CellPadding="0" CellSpacing="1" DataKeyNames="FullName"> <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 void ShowDirectoryContents(string path) { // Define the current directory. DirectoryInfo dir = new DirectoryInfo(path); // Get the DirectoryInfo and FileInfo objects. FileInfo[] files = dir.GetFiles(); DirectoryInfo[] dirs = dir.GetDirectories();

Copy()

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