TcpClient.Active Property
Gets or set a value that indicates whether a connection has been made.
Assembly: System (in System.dll)
Classes deriving from TcpClient can use this property to determine if a connection attempt has succeeded. It does not monitor the ongoing connection state of TcpClient. If the remote host closes the connection, Active will not be updated. If you are deriving from TcpClient and require closer attention to the connection state, use the Connected property of the Socket returned by the Client method.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.