WriteByte Method

Stream.WriteByte Method

Writes a byte to the current position in the stream and advances the position within the stream by one byte.

[Visual Basic]
Public Overridable Sub WriteByte( _
   ByVal value As Byte _
public virtual void WriteByte(
 byte value
public: virtual void WriteByte(
 unsigned char value
public function WriteByte(
   value : Byte


The byte to write to the stream.


Exception Type Condition
IOException An I/O error occurs.
NotSupportedException The stream does not support writing, or the stream is already closed.
ObjectDisposedException Methods were called after the stream was closed.


For an example of creating a file and writing text to a file, see Writing Text to a File. For an example of reading text from a file, see Reading Text from a File. For an example of reading from and writing to a binary file, see Reading and Writing to a Newly Created Data File.

Use the CanWrite property to determine whether the current instance supports writing.

Notes to Implementers:  The default implementation on Stream creates a new single-byte array and then calls Write. While this is formally correct, it is inefficient. Any stream with an internal buffer should override this method and provide a much more efficient version that reads the buffer directly, avoiding the extra array allocation on every call.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard

See Also

Stream Class | Stream Members | System.IO Namespace | Working with I/O | Reading Text from a File | Writing Text to a File

© 2015 Microsoft