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because you don t want to add an extra trailing slash to a path (as in the invalid path c:\\myfile.txt). To solve this problem, the page uses the Combine() method of the Path class. This method correctly joins any file and path name together, adding the \ when required. The code includes all the necessary error handling code. If you attempt to read the information for a file that you aren t permitted to examine, the error message is displayed instead of the file details section. If an error occurs when calling DirectoryInfo.GetFiles() or DirectoryInfo.GetDirectories(), the error is simply ignored and the files or subdirectories aren t shown. This error occurs if the account that s running your code doesn t have permission to read the contents of the directory. For example, this occurs if you try to access the c:\System Volume Information directory in Windows and you re not an administrator. The ShowFilesIn() and ShowDirectoriesIn() methods loop through the file and directory collections to build the lists. Another approach is to use data binding instead, as shown in the following code sample: // Another way to fill lstFiles. DirectoryInfo dirInfo = new DirectoryInfo(dir); lstFiles.DataSource = dirInfo.GetFiles(); lstFiles.DataMember = "Name"; lstFiles.DataBind(); Just remember that when you bind a collection of objects, you need to specify which property will be used for the list. In this case, it s the DirectoryInfo.Name or FileInfo.Name property.

validation (or the browser doesn t support it). In this situation, the page is posted back, but the SqlDataSource notices that it contains invalid data and doesn t attempt to perform its update. For more information about client-side and server-side validation, refer to 10.

It has been a long-standing issue with PHP s inheritance model that a parent class could not easily reference the final state of the class when extended. Consider the example shown in Listing 5-11. Listing 5-11. Unintended Inheritance < php class ParentBase { static $property = 'Parent Value'; public static function render() { return self::$property; } } class Descendant extends ParentBase { static $property = 'Descendant Value'; } echo Descendant::render();

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The .NET Framework makes it easy to create simple flat files in text or binary format. Unlike a database, these files don t have any internal structure (that s why they re called flat). Instead, these files are really just a list of whatever information you want to store.

So far, all the examples you ve seen have used a CommandField that automatically generates edit controls. However, now that you ve made the transition over to a template-based approach, it s worth considering how you can add your own edit controls. It s actually quite easy. All you need to do is add a button control to the item template and set the CommandName to Edit. This automatically triggers the editing process, which fires the appropriate events and switches the row into edit mode. <ItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /> <b>Reorder:</b> <%# Eval("ReorderLevel") %> <br /><br /> <asp:LinkButton runat="server" Text="Edit" CommandName="Edit" ID="Linkbutton1" /> </ItemTemplate> In the edit item template, you need two more buttons with CommandName values of Update and Cancel: <EditItemTemplate> <b>In Stock:</b> <%# Eval("UnitsInStock") %><br /> <b>On Order:</b> <%# Eval("UnitsOnOrder") %><br /><br /> <b>Reorder:</b> <asp:TextBox Text='<%# Bind("ReorderLevel") %>' Width="25px" runat="server" id="txtReorder" /> <br /><br /> <asp:LinkButton runat="server" Text="Update" CommandName="Update" ID="Linkbutton1" /> <asp:LinkButton runat="server" Text="Cancel" CommandName="Cancel" ID="Linkbutton2" CausesValidation="False" /> </EditItemTemplate> Notice that the Cancel button must have its CausesValidation property set to False to bypass validation. That way, you can cancel the edit even if the current data isn t valid. As long as you use these names, the GridView editing events will fire and the data source controls will react in the same way as if you were using the automatically generated editing controls. Figure 17-16 shows the custom edit buttons.

You can write to a file and read from a file using a StreamWriter and a StreamReader dedicated classes that abstract away the process of file interaction. There really isn t much to it. You can create the StreamWriter and StreamReader classes on your own, or you can use one of the helpful static methods included in the File class, such as CreateText() or OpenText(). Here s an example that gets a StreamWriter for writing data to the file c:\myfile.txt: // Define a StreamWriter (which is designed for writing text files). StreamWriter w; // Create the file, and get a StreamWriter for it. w = File.CreateText(@"c:\myfile.txt");

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