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FileSystem.OpenTextFileWriter Method (String, Boolean, Encoding)

Opens a StreamWriter to write to the specified file.

Namespace:  Microsoft.VisualBasic.FileIO
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static StreamWriter OpenTextFileWriter(
	string file,
	bool append,
	Encoding encoding


Type: System.String
File to be written to.
Type: System.Boolean
True to append to the contents in the file; False to overwrite the contents of the file. Default is False.
Type: System.Text.Encoding
Encoding to be used in writing to the file. Default is ASCII.

Return Value

Type: System.IO.StreamWriter
StreamWriter object to write to the specified file.


The file name ends with a trailing slash.

The OpenTextFileWriter method opens and initializes a stream for a file and then returns the StreamWriter object for that stream. You can write to the steam as many times as necessary and then close it when you are finished.


You must call the Close method on the StreamWriter object to make sure that all data is correctly written to the underlying stream.

If you are writing only a few strings to a file, it might be simpler to use the WriteAllText method.

The following table lists an example of a task involving the My.Computer.FileSystem.OpenTextFileWriter method.



Write text to a file with a StreamWriter

How to: Write Text to Files with a StreamWriter in Visual Basic

This example opens a StreamWriter with the My.Computer.FileSystem.OpenTextFileWriter method and uses it to write a string to a text file with the WriteLine method of the StreamWriter class.

Dim file = My.Computer.FileSystem.OpenTextFileWriter(
    "c:\test.txt", True)
file.WriteLine("Here is the first string.")

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.