Mutex.TryOpenExisting Method

For apps that target Windows Phone OS 7.0 and 7.1, do not use this member in your app. If you do, your code will throw a MethodAccessException. This member is security-critical, which restricts it to internal use by the .NET Framework for Windows Phone class library.


[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Opens the specified named mutex, if it already exists, and returns a value that indicates whether the operation succeeded.

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


<SecurityCriticalAttribute> _
Public Shared Function TryOpenExisting ( _
    name As String, _
    <OutAttribute> ByRef result As Mutex _
) As Boolean
public static bool TryOpenExisting(
    string name,
    out Mutex result


  • result
    Type: System.Threading..::.Mutex%
    When this method returns, contains a Mutex object that represents the named mutex if the call succeeded, or nullNothingnullptra null reference (Nothing in Visual Basic) if the call failed. This parameter is treated as uninitialized.

Return Value

Type: System..::.Boolean
true if the named mutex was opened successfully; otherwise, false.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0

See Also


Mutex Class

System.Threading Namespace