This documentation is archived and is not being maintained.

FileStream.Unlock Method

Allows access by other processes to all or part of a file that was previously locked.

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

Public Overridable Sub Unlock ( _
	position As Long, _
	length As Long _


Type: System.Int64
The beginning of the range to unlock.
Type: System.Int64
The range to be unlocked.


position or length is negative.

For a list of common I/O tasks, see Common I/O Tasks.

This code example is part of a larger example provided for the Lock method.

' Unlock the specified part of the file.
Case "U"C
        aFileStream.Unlock( _
            textLength - 1, byteCount)
        Console.WriteLine("The specified part " & _
            "of file has been unlocked.")
    Catch ex As IOException
        Console.WriteLine( _
            "{0}: The specified part of file " & _
            "is not locked by the current " & _
            "process.", ex.GetType().Name)
    End Try
    Exit Select

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.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.