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For that reason, it s common to add a Button control to post back the page To get information about the posted file content, you can access the FileUploadPostedFile object You can save the content by calling the PostedFileSaveAs() method, as demonstrated in the following example Here s the event-handling code for the ButtonClick event: Protected Sub cmdUpload_Click(ByVal sender As Object, ByVal e As SystemEventArgs) ' Check whether a file was submitted If UploaderPostedFileContentLength <> 0 Then Try If UploaderPostedFileContentLength > 1064 Then ' This exceeds the size limit you want to allow ' You should check the size to prevent a denial of ' service attack that attempts to fill up your ' web server's hard drive ' You might also want to check the amount of ' remaining free space lblStatusText = "Too large.

Accepts two parameters: the fully qualified source filename and the fully qualified destination filename To allow overwriting, use the version that takes a Boolean third parameter and set it to true Deletes the specified file but doesn t throw an exception if the file can t be found Indicates true or false whether a specified file exists Retrieves or sets an enumerated value that can include any combination of the values from the FileMode enumeration Returns a DateTime object that represents the time the file was created, accessed, or last written to Each Get method has a corresponding Set method, which isn t shown in this table Accepts two parameters: the fully qualified source filename and the fully qualified destination filename You can move a file across drives and even rename it while you move it (or rename it without moving it).

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// Show the directory listing. lblCurrentDir.Text = "Currently showing " + path; gridFileList.DataSource = files; gridDirList.DataSource = dirs; Page.DataBind(); // Clear any selection. gridFileList.SelectedIndex = -1; // Keep track of the current path. ViewState["CurrentPath"] = path; } When the page first loads, it calls this method to show the current application directory: protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { ShowDirectoryContents(Server.MapPath(".")); } } You ll notice that the ShowDirectoryContents() method stores the currently displayed directory in view state. That allows the Move Up button to direct the user to a directory that s one level above the current directory: protected void cmdUp_Click(object sender, System.EventArgs e) { string path = (string)ViewState["CurrentPath"]; path = Path.Combine(path, ".."); path = Path.GetFullPath(path); ShowDirectoryContents(path); } To move down through the directory hierarchy, the user simply needs to click a directory link. This is raised as a SelectedIndexChanged event. The event handler then displays the new directory: protected void gridDirList_SelectedIndexChanged(object source, EventArgs e) { // Get the selected directory. string dir = (string)gridDirList.DataKeys[gridDirList.SelectedIndex].Value; // Now refresh the directory list to // show the selected directory. ShowDirectoryContents(dir); } But what happens if a user selects a file from the second GridView In this case, the code retrieves the full file path, creates a new FileInfo object, and binds it to a FormView control, which uses a template to display several pieces of information about the file. Figure 13-2 shows the result.

This file is not allowed" Else ' Retrieve the physical directory path for the Upload ' subdirectory Dim destDir As String = ServerMapPath("/Upload") ' Extract the filename part from the full path of the ' original file Dim fName As String = PathGetFileName(UploaderPostedFileFileName) ' Combine the destination directory with the filename Dim destPath As String = PathCombine(destDir, fName) ' Save the file on the server..

Creates the specified file and returns a FileStream object that you can use to write to it CreateText() performs the same task but returns a StreamWriter object that wraps the stream Opens a file (provided it exists) OpenText() and OpenWrite() open a file in read-only mode, returning a FileStream or StreamReader OpenWrite() opens a file in write-only mode, returning a FileStream Reads the entire file and returns its contents as a single string, an array of strings (one for each line), or an array of bytes Use this method only for very small files For larger files, use streams to read one chunk at a time and reduce the memory overhead Writes an entire file in one shot using a supplied string, array of strings (one for each line), or array of bytes If the file already exists, it is overwritten Returns a SystemSecurityAccessControlDirectorySecurity object.

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