Code: Writing Text to a File (Visual Basic)

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#file #basic #application #access #deployment #exception

This example writes a string to a text file using the WriteLine method of the StreamWriter class.

Example

Dim file As New System.IO.StreamWriter("c:/test.txt")
file.WriteLine("Here is the first line.")
file.Close()

Compiling the Code

This example requires:

A reference to System namespace.

Robust Programming

The following conditions may cause an exception:

The file exists and is read-only ( tabindex="0" keywords="frlrfSystemIOIOExceptionClassTopic">IOException Class).
The disk is full ( tabindex="0" keywords="frlrfSystemIOIOExceptionClassTopic">IOException Class).
The pathname is too long ( tabindex="0" keywords="frlrfSystemIOPathTooLongExceptionClassTopic">PathTooLongException Class).

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 (see tabindex="0" keywords="vxconAccessControl">Access Control). 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.