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CopyTo Method (Stream, Int32)
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Stream.CopyTo Method (Stream, Int32)

Reads all the bytes from the current stream and writes them to a destination stream, using a specified buffer size.

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

public void CopyTo(
	Stream destination,
	int bufferSize


Type: System.IO.Stream
The stream that will contain the contents of the current stream.
Type: System.Int32
The size of the buffer. This value must be greater than zero. The default size is 4096.


destination is null.


bufferSize is negative or zero.


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.

.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.

Community Additions

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