This documentation is archived and is not being maintained.

Process.SessionId Property

Updated: October 2010

Gets the Terminal Services session identifier for the associated process.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

public int SessionId { get; }

Property Value

Type: System.Int32
The Terminal Services session identifier for the associated process.


There is no session associated with this process.


There is no process associated with this session identifier.


The associated process is not on this machine.


The SessionId property is not supported on Windows 98.

The SessionId property identifies the session in which the application is currently running.

  • LinkDemand 

    for full trust for the immediate caller. This member cannot be used by partially trusted code.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0




October 2010

Added NullReferenceException to exception table.

Customer feedback.