Available is a way to determine whether data is queued for reading. If data is available, call Read to get the data. The available data is the total amount of data queued in the network buffer for reading. If no data is queued in the network buffer, Available returns 0.
Windows 8.1, Windows Server 2012 R2, 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)