This documentation is archived and is not being maintained.

Stream.CopyTo Method (Stream)

Reads the bytes from the current stream and writes them to the destination stream.

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

member CopyTo : 
        destination:Stream -> unit 


Type: System.IO.Stream
The stream that will contain the contents of the current stream.


destination is a null reference (Nothing in Visual Basic).


The current stream does not support reading.


destination does not support writing.


Either the current stream or destination were closed before the CopyTo method was called.


An I/O error occurred.

Copying begins at the current position in the current stream.

The following example copies the contents of a FileStream to a MemoryStream.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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