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Using the FileMode Enumeration

When you open a file with the FileStream class, you specify the file mode you want to use—for example, if you want to create a new file, you use the file mode FileMode.Create. The various possible file modes are part of the FileMode enumeration; you can find the members of this enumeration in Table 13.9.

Table 13.9: Members of the FileMode enumeration.

Member

Means

Append

Opens a file and moves to the end of the file (or creates a new file if the specified file doesn't exist). Note that you can only use FileMode.Append with FileAccess.Write.

Create

Creates a new file; if the file already exists, it is overwritten.

CreateNew

Creates a new file; if the file already exists, an IOException is thrown.

Open

Opens an existing file.

OpenOrCreate

Open a file if it exists; or create a new file.

Truncate

Open an existing file, and truncate it to zero length so you can write over its data.

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