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Forms are generally intended to receive input all at once, process that input and behave accordingly. This is something of a one-off cycle, where the only reason a form would have to be redisplayed would be to show validation errors, allowing the user to fix them and resubmit. If a user needs to stop working on a form for a time and come back later, that means starting over from scratch. While this is generally the accepted approach, it can also be a burden for complex forms or those where the user might need to provide information that takes time to gather, such as tax information. In these situations, it would be much more useful to be able to save the form in a partially-filled state and return to it at a later point in time. That s not how forms typically work, so there s clearly some work to be done, but it s really not that hard. Since forms are declared as classes, and there s no reason to violate that presumption, the class developed hereafter will be usable as a parent class, just like . In fact, for all intents and purposes, it should be a drop-in replacement for the standard class, simply imbuing its subclasses with extra functionality. Consider the following form for making an offer on a house in a properties application, something which usually won t be taken lightly. By allowing the form to be pended and resumed at a later time, users can take the necessary time to review an offer before committing to such an investment.

Opens the file if it exists and seeks to the end of the file, or creates a new file. Specifies that the operating system should create a new file. If the file already exists, it will be overwritten. Specifies that the operating system should create a new file. If the file already exists, an IOException is thrown.

Specifies that the operating system should open an existing file. Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. Specifies that the operating system should open an existing file. Once opened, the file will be truncated so that its size is 0 bytes.

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And here s how you can open a FileStream and read its contents into a byte array: FileStream fileStream = null; try { fileStream = new FileStream(fileName, FileMode.Open); byte[] dataArray = new byte[fileStream.Length]; for(int i = 0; i < fileStream.Length; i++) { dataArray[i] = fileStream.ReadByte(); } } finally { if (fileStream != null) fileStream.Close(); } On their own, streams aren t that useful. That s because they work entirely in terms of single bytes and byte arrays. .NET includes a more useful higher-level model of writer and reader objects that fill the gaps. These objects wrap stream objects and allow you to write more complex data, including common data types such as integers, strings, and dates. You ll see readers and writers at work in the following sections.

Note that, aside from the switch to , this is defined like any other standard Django form. The advantages of this simple change are described in the following sections, which outline a new application.

Whenever you open a file through a FileStream, remember to call the FileStream.Close() method when Tip you re finished. This releases the handle on the file and makes it possible for someone else to access the file. In addition, because the FileStream class is disposable, you can use it with the using statement, which ensures that the FileStream is closed as soon as the block ends.

You can write to a file and read from a file using the StreamWriter and StreamReader classes in the System.IO namespace. When creating these classes, you simply pass the underlying stream as a constructor argument. For example, here s the code you need to create a StreamWriter using an existing FileStream: FileStream fileStream = new FileStream(@"c:\myfile.txt", FileMode.Create); StreamWriter w = new StreamWriter(fileStream); You can also use one of the static methods included in the File and FileInfo classes, such as CreateText() or OpenText(). Here s an example that uses this technique to get a StreamWriter: StreamWriter w = File.CreateText(@"c:\myfile.txt"); This code is equivalent to the earlier example.

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