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You can represent a string in binary form using more than one way, depending on the encoding you use. The most common encodings include the following: ASCII: Encodes each character in a string using 7 bits. ASCII-encoded data can t contain extended Unicode characters. When using ASCII encoding in .NET, the bits will be padded, and the resulting byte array will have 1 byte for each character. Full Unicode (or UTF-16): Represents each character in a string using 16 bits. The resulting byte array will have 2 bytes for each character. UTF-7 Unicode: Uses 7 bits for ordinary ASCII characters and multiple 7-bit pairs for extended characters. This encoding is primarily for use with 7-bit protocols such as mail, and it isn t regularly used. UTF-8 Unicode: Uses 8 bits for ordinary ASCII characters and multiple 8-bit pairs for extended characters. The resulting byte array will have 1 byte for each character (provided there are no extended characters). .NET provides a class for each type of encoding in the System.Text namespace. When using the StreamReader and StreamWriter, you can specify the encoding you want to use with a constructor argument, or you can simply use the default UTF-8 encoding. Here s an example that creates a StreamWriter that uses ASCII encoding: Dim fStream As New FileStream("c:\myfile.txt", FileMode.Create) Dim w As New StreamWriter(fStream, System.Text.Encoding.ASCII)

The Directory and File classes provide a number of useful methods. Tables 13-1 and 13-2 tell the whole story. Note that every method takes the same parameter: a fully qualified path name identifying the directory or file you want the operation to act on. Table 13-1. Directory Methods

HasExtension() IsPathRooted()

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Once you have the StreamWriter, you can use the Write() or WriteLine() method to add information to the file Both of these methods are overloaded so that they can write many simple data types, including strings, integers, and other numbers These values are essentially all converted into strings when they re written to a file, and they must be converted back into the appropriate types manually when you read the file To make this process easier, you should put each piece of information on a separate line by using WriteLine() instead of Write(), as shown here: wWriteLine("ASPNET Text File Test") ' Write a string wWriteLine(1000) ' Write a number When you finish with the file, you must make sure you close it Otherwise, the changes may not be properly written to disk, and the file could be locked open.

CreateDirectory()

Although the Path class contains methods for drilling down the directory structure (adding subdirectories to directory paths), it doesn t provide any methods for going back up (removing subdirectories from directory paths). However, you can work around this limitation by using the Combine() method with the relative path .., which means move one directory up. For good measure, you can also use the GetFullPath() method on the result to return it to a normal form. Here s an example: string path = @"c:\temp\subdir"; path = Path.Combine(path, ".."); // path now contains the string "c:\temp\subdir\.." path = Path.GetFullPath(path); // path now contains the string "c:\temp"

At any time, you can also call the Flush() method to make sure all data is written to disk, as the StreamWriter will perform some in-memory caching of your data to optimize performance (which is usually exactly the behavior you want) ' Tidy up wFlush() wClose() When reading information, you use the Read() or ReadLine() method of the StreamReader The Read() method reads a single character, or the number of characters you specify, into the buffer that you specify It returns an Integer containing the number of characters read The ReadLine() method returns a string with the content of an entire line ReadLine() starts at the first line and advances the position to the end of the file, one line at a time Here s a code snippet that opens and reads the file created in the previous example: Dim r As StreamReader = FileOpenText("c:\myfile.

Creates a new directory. If you specify a directory inside another nonexistent directory, ASP.NET will thoughtfully create all the required directories. Deletes the corresponding empty directory. To delete a directory along with its contents (subdirectories and files), add the optional second parameter of true. Returns true or false to indicate whether the specified directory exists. Returns a DateTime object that represents the time the directory was created, accessed, or written to. Each Get method has a corresponding Set method, which isn t shown in this table. Returns an array of strings, one for each subdirectory, file, or drive in the specified directory (depending on which method you re using). This method can accept a second parameter that specifies a search expression (such as ASP*.*). Drive letters are in the format of c:\.

In most cases, an exception will be thrown if you supply a path that contains illegal characters to one of these methods. However, path names that contain a wildcard character (* or ) will not cause the methods to throw an exception.

txt") Dim inputString As String inputString = rReadLine() ' = "ASPNET Text File Test" inputString = rReadLine() ' = "1000".

Delete()

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