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

This example opens a StreamWriter object 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.

Example

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

Robust Programming

The following conditions may cause an exception:

• The file exists and is read-only (IOException).

• The disk is full (IOException).

• The pathname is too long (PathTooLongException).

.NET Framework Security

This example creates a new file, if the file does not already exist. If an application needs to create a file, that application needs Create access for the folder. If the file already exists, the application needs only Write access, a lesser privilege. Where possible, it is more secure to create the file during deployment, and only grant Read access to a single file, rather than Create access for a folder.

See also

• StreamWriter
• OpenTextFileWriter
• How to: Read from Text Files
• Writing to Files