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CSS includes a fixed set of units and keywords as values for several of its properties. The first section of this appendix covers these property values. Later in the appendix, when we cover individual properties you ll find references to these predefined values.

The GetFiles() method returns an array of FileInfo objects, each of which exposes details of a particular file (you will learn the full details of the FileInfo type later in this chapter). Assume that you have the following static method of the Program class, which you call from Main(): static void DisplayImageFiles() { DirectoryInfo dir = new DirectoryInfo(@"C:\Windows\Web\Wallpaper");

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Considering how we used HTML encoding and JavaScript string encoding to block injection attacks earlier in this chapter, it would at first seem logical to look for an equivalent kind of SQL string encoding to block SQL injection attacks (or perhaps to validate incoming values against a blacklist of disallowed character sequences) for example: string sql = string.Format( "SELECT 1 FROM [Users] WHERE Username='{0}' AND Password='{1}'", username.Replace("'", "''"), password.Replace("'", "''")); But if you re working with SQL Server, please don t use this kind of solution! Not only is it difficult to remember to keep doing it all the time, but there can still be ways to bypass the protection. For example, if the attacker replaces ' with \', you ll translate it to \'', but \' is a special control sequence, so the attack is back, and this time it s personal.

// Get all files with a *.jpg extension. FileInfo[] imageFiles = dir.GetFiles("*.jpg", SearchOption.AllDirectories); // How many were found Console.WriteLine("Found {0} *.jpg files\n", imageFiles.Length); // Now print out info for each file. foreach (FileInfo f in imageFiles) { Console.WriteLine("***************************"); Console.WriteLine("File name: {0}", f.Name); Console.WriteLine("File size: {0}", f.Length); Console.WriteLine("Creation: {0}", f.CreationTime); Console.WriteLine("Attributes: {0}", f.Attributes); Console.WriteLine("***************************\n"); } } Notice you specify a search option when you call GetFiles(); you do this to look within all subdirectories of the root. Once you run the application, you see a listing of all files that match the search pattern.

The real solution is to use SQL Server s parameterized queries instead of pure dynamic queries. Stored procedures are one form of parameterized query, but it s equally good to send a parameterized query directly from your C# code4 for example: string query = "SELECT 1 FROM [Users] WHERE Username=@username AND Password=@pwd"; SqlCommand command = new SqlCommand(query); command.Parameters.Add("@username", SqlDbType.NVarChar, 50).Value = username; command.Parameters.Add("@pwd", SqlDbType.NVarChar, 50).Value = password; DataTable results = MyDatabase.ExecuteCommand(command);

You can programmatically extend a directory structure using the DirectoryInfo.CreateSubdirectory() method. This method can create a single subdirectory, as well as multiple nested subdirectories, in a single function call. This method illustrates how to do so, extending the directory structure of the C: drive with some custom subdirectories: static void ModifyAppDirectory() { DirectoryInfo dir = new DirectoryInfo(@"C:\"); // Create \MyFolder off application directory. dir.CreateSubdirectory("MyFolder"); // Create \MyFolder2\Data off application directory. dir.CreateSubdirectory(@"MyFolder2\Data"); } If you call this method from within Main() and examine your Windows directory using Windows Explorer, you will see that the new subdirectories are present and accounted for (see Figure 20-2).

Figure 20-2. Creating subdirectories You are not required to capture the return value of the CreateSubdirectory() method, but you should be aware that a DirectoryInfo object representing the newly created item is passed back on successful execution. Consider the following update to the previous method: static void ModifyAppDirectory() { DirectoryInfo dir = new DirectoryInfo("."); // Create \MyFolder off initial directory. dir.CreateSubdirectory("MyFolder"); // Capture returned DirectoryInfo object. DirectoryInfo myDataFolder = dir.CreateSubdirectory(@"MyFolder2\Data"); // Prints path to ..\MyFolder2\Data. Console.WriteLine("New Folder is: {0}", myDataFolder); }

Numeric values in CSS can be either factors (decimal numbers) or integers (whole numbers). In most cases, negative versions of both are allowed.

4 Thousands will tell you that stored procedures are somehow faster or more secure, but the arguments don t match the facts. Stored procedures are nothing but parameterized queries (just stored in the database). The execution plan caching is identical. I m not saying you shouldn t use stored procedures, just that you don t have to.

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