FileSystem.WriteAllText Method (String, String, Boolean)
Writes text to a file.
Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)
The path is not valid for one of the following reasons: it is a zero-length string; it contains only white space; it contains invalid characters; or it is a device path (starts with \\.\); it ends with a trailing slash.
file is Nothing.
The file does not exist.
The file is in use by another process, or an I/O error occurs.
The path exceeds the system-defined maximum length.
A file or directory name in the path contains a colon (:) or is in an invalid format.
There is not enough memory to write the string to buffer.
The user lacks necessary permissions to view the path.
The UTF-8 encoding is used to write to the file. To specify a different encoding, use a different overload of the WriteAllText method.
If the specified file does not exist, it is created.
If the specified encoding does not match the existing encoding of the file, the specified coding is ignored.
The WriteAllText method opens a file, writes to it, and then closes it. Code that uses the WriteAllText method is simpler than code that uses a StreamWriter object. However, if you are adding strings to a file by using a loop, a StreamWriter object can provide better performance because you only have to open and close the file one time. For more information, see the OpenTextFileWriter method.
The following table lists examples of tasks involving the My.Computer.FileSystem.WriteAllText method.
Write text to a file
Append text to a file
This example writes the line "This is new text to be added." to the file Test.txt, overwriting any existing text in the file.
My.Computer.FileSystem.WriteAllText("C:\TestFolder1\test.txt", "This is new text to be added.", False)
This example writes the names of the files in the Documents and Settings folder to FileList.txt, inserting a carriage return between each for better readability.
Available since 2.0