Write Method

BufferedStream.Write Method

Copies bytes to the buffered stream and advances the current position within the buffered stream by the number of bytes written.

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

virtual void Write (
	array<unsigned char>^ array, 
	int offset, 
	int count
) override
public void Write (
	byte[] array, 
	int offset, 
	int count
public override function Write (
	array : byte[], 
	offset : int, 
	count : int
Not applicable.



The byte array from which to copy count bytes to the current buffered stream.


The offset in the buffer at which to begin copying bytes to the current buffered stream.


The number of bytes to be written to the current buffered stream.

Exception typeCondition


Length of array minus offset is less than count.


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


offset or count is negative.


The stream is closed or a null reference (Nothing in Visual Basic).


The stream does not support writing.


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.

This code example is part of a larger example provided for the BufferedStream class.

// Send the data using the BufferedStream.
Console::WriteLine( "Sending data using BufferedStream." );
startTime = DateTime::Now;
for ( int i = 0; i < numberOfLoops; i++ )
   bufStream->Write( dataToSend, 0, dataToSend->Length );

bufferedTime = (DateTime::Now - startTime).TotalSeconds;
Console::WriteLine( "{0} bytes sent in {1} seconds.\n", (numberOfLoops * dataToSend->Length).ToString(), bufferedTime.ToString(  "F1" ) );

// Send the data using the BufferedStream.
Console.WriteLine("Sending data using BufferedStream.");
startTime = DateTime.get_Now();
for(int i=0;i < numberOfLoops;i++) {
    bufStream.Write(dataToSend, 0, dataToSend.length);
bufferedTime = 
Console.WriteLine("{0} bytes sent in {1} seconds.\n",
    System.Convert.ToString (numberOfLoops * dataToSend.length),

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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