StreamWriter Constructor (String)

When it is called by trusted applications, initializes a new instance of the StreamWriter class for the specified file on the specified path, using the default encoding and buffer size.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

Public Sub New ( _
	path As String _


Type: System.String
The complete file path to write to. path can be a file name.


Access is denied.


path is an empty string ("").


path contains the name of a system device (com1, com2, and so on).


path is Nothing.


The specified path is invalid; for example, it might refer to an unmapped drive.


The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.


path includes an incorrect or invalid syntax for file name, directory name, or volume label syntax.


The caller does not have the required permission.

Platform Notes

Silverlight for Windows Phone Silverlight for Windows Phone

 This member has a SecurityCriticalAttribute attribute on Silverlight for Windows Phone, because the attribute was present in Silverlight 3. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.