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UdpClient.SendAsync Method (Byte[], Int32)

.NET Framework 4.5

Sends a UDP datagram asynchronously to a remote host.

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

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public Task<int> SendAsync(
	byte[] datagram,
	int bytes
)

Parameters

datagram
Type: System.Byte[]

An array of type Byte that specifies the UDP datagram that you intend to send represented as an array of bytes.

bytes
Type: System.Int32

The number of bytes in the datagram.

ExceptionCondition
ArgumentNullException

dgram is null.

InvalidOperationException

The UdpClient has already established a default remote host.

ObjectDisposedException

The UdpClient is closed.

SocketException

An error occurred when accessing the socket. See the Remarks section for more information.

This overload sends datagrams to the remote host established in the Connect method. If you do not call Connect before calling this overload, the method will throw a SocketException. If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. Once you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation in MSDN for a detailed description of the error.

If you want to send datagrams to a different remote host, you must call the Connect method and specify the desired remote host. Use either of the other SendAsync method overloads to send datagrams to a broadcast address.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4.6, 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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