UdpAnySourceMulticastClient.BeginSendToGroup Method

Begins the operation of sending a packet to a joined multicast group and invokes the specified callback when a packet has been sent to the group.

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

Public Function BeginSendToGroup ( _
	buffer As Byte(), _
	offset As Integer, _
	count As Integer, _
	callback As AsyncCallback, _
	state As Object _
) As IAsyncResult


Type: System.Byte()
The buffer that contains the data to send.
Type: System.Int32
The offset, in bytes, from the beginning of the buffer to read the data to be sent.
Type: System.Int32
The number of bytes to send from the buffer.
Type: System.AsyncCallback
The callback method to invoke when the operation completes.
Type: System.Object
Optional state information to pass to the callback method for this operation.

Return Value

Type: System.IAsyncResult
An IAsyncResult that references this operation.


buffer is Nothing.


offset is less than 0


offset is greater than the length of the buffer.


count is less than 0


offset plus the count is greater than the length of the buffer.


The multicast group has not yet been joined.


The UdpAnySourceMulticastClient has been disposed.


An error occurred when attempting to access the socket for sending. See the Remarks section for more information.

The BeginSendToGroup method begins an operation of sending a UDP packet to the joined multicast group.

The client must have completed a join to the multicast group.

The method specified in the callback parameter is invoked when a packet has been sent.

It is possible to have a socket failure if a send operation fails synchronously, although this is uncommon with UDP. If a socket failure occurs, a SocketException is thrown. The error received is specified as a member of the System.Net.Sockets.SocketError enumeration.


Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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