When a stream is initialized, this property is set to zero.
Although you can set the position of the stream beyond the stream's capacity, you will not be able to access that area using the Read and Write methods. Read will return 0 and Write will throw a NotSupportedException. This support is primarily for design and code compatibility with basic stream operations.
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)