Send Method (IList(ArraySegment(Byte)))

Socket.Send Method (IList<ArraySegment<Byte>>)


Sends the set of buffers in the list to a connected Socket.

Namespace:   System.Net.Sockets
Assembly:  System (in System.dll)

public int Send(
	IList<ArraySegment<byte>> buffers


Type: System.Collections.Generic.IList<ArraySegment<Byte>>

A list of ArraySegment<T>s of type Byte that contains the data to be sent.

Return Value

Type: System.Int32

The number of bytes sent to the Socket.

Exception Condition

buffers is null.


buffers is empty.


An error occurred when attempting to access the socket. See remarks section below.


The Socket has been closed.

Send can be used for both connection-oriented and connectionless protocols.

This overload requires at least one buffer that contains the data you want to send.

If you are using a connectionless protocol, you must call Connect before calling this method, or Send will throw a SocketException. If you are using a connection-oriented protocol, you must either use Connect to establish a remote host connection, or use Accept to accept an incoming connection.

If you are using a connectionless protocol and plan to send data to several different hosts, you should use the SendTo method. If you do not use the SendTo method, you will have to call Connect before each call to Send. You can use SendTo even after you have established a default remote host with Connect. You can also change the default remote host prior to calling Send by making another call to Connect.

If you are using a connection-oriented protocol, Send will block until all of the bytes in the buffer are sent, unless a time-out was set by using Socket.SendTimeout. If the time-out value was exceeded, the Send call will throw a SocketException. In nonblocking mode, Send may complete successfully even if it sends less than the number of bytes in the buffer. It is your application's responsibility to keep track of the number of bytes sent and to retry the operation until the application sends the bytes in the buffer. There is also no guarantee that the data you send will appear on the network immediately. To increase network efficiency, the underlying system may delay transmission until a significant amount of outgoing data is collected. A successful completion of the Send method means that the underlying system has had room to buffer your data for a network send.


If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error.


The successful completion of a send does not indicate that the data was successfully delivered. If no buffer space is available within the transport system to hold the data to be transmitted, send will block unless the socket has been placed in nonblocking mode.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

.NET Framework
Available since 2.0
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