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Path.GetTempFileName Method

Creates a uniquely named, zero-byte temporary file on disk and returns the full path of that file.

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

public static string GetTempFileName ()
public static String GetTempFileName ()
public static function GetTempFileName () : String

Return Value

A String containing the full path of the temporary file.

Exception typeCondition


An I/O error occurs, such as no unique temporary file name is available.

- or -

This method was unable to create a temporary file.

This method creates a temporary file with a .TMP file extension.

The GetTempFileName method will raise an IOException if it is used to create more than 65535 files without deleting previous temporary files.

The GetTempFileName method will raise an IOException if no unique temporary file name is available. To resolve this error, delete all unneeded temporary files.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Retrieve a file extension.


Retrieve the fully qualified path of a file.


Retrieve the file name and extension from a path.


Retrieve only the file name from a path.


Retrieve only the directory name from a path.


Change the extension of a file.


Determine if a directory exists.


Determine if a file exists.


Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0