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Ping.Send Method (String, Int32, Byte[])

Attempts to send an Internet Control Message Protocol (ICMP) echo message with the specified data buffer to the specified computer, and receive a corresponding ICMP echo reply message from that computer. This overload allows you to specify a time-out value for the operation.

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

public PingReply Send(
	string hostNameOrAddress,
	int timeout,
	byte[] buffer
)

Parameters

hostNameOrAddress
Type: System.String
A String that identifies the computer that is the destination for the ICMP echo message. The value specified for this parameter can be a host name or a string representation of an IP address.
timeout
Type: System.Int32
An Int32 value that specifies the maximum number of milliseconds (after sending the echo message) to wait for the ICMP echo reply message.
buffer
Type: System.Byte[]
A Byte array that contains data to be sent with the ICMP echo message and returned in the ICMP echo reply message. The array cannot contain more than 65,500 bytes.

Return Value

Type: System.Net.NetworkInformation.PingReply
A PingReply object that provides information about the ICMP echo reply message if one was received, or provides the reason for the failure if no message was received.

ExceptionCondition
ArgumentException

The size of buffer exceeds 65500 bytes.

ArgumentNullException

hostNameOrAddress is null or is an empty string ("").

-or-

buffer is null, or the buffer size is greater than 65500 bytes.

ArgumentOutOfRangeException

timeout is less than zero.

InvalidOperationException

A call to SendAsync is in progress.

PingException

An exception was thrown while sending or receiving the ICMP messages. See the inner exception for the exact exception that was thrown.

ObjectDisposedException

This object has been disposed.

If the ICMP echo reply message is not received within the time specified in the timeout parameter, the ICMP echo fails, and the Status property is set to TimedOut.

NoteNote

When specifying very small numbers for timeout, the Ping reply can be received even if timeout milliseconds have elapsed.

This overload uses default settings for packet fragmentation and packet forwarding. The packet that contains the ICMP echo message can be fragmented in transit if the total packet size exceeds the maximum packet size that can be transmitted by one of the routing nodes between the local and remote computers. To prevent fragmentation, use one of the Send methods that takes an options parameter, and set the DontFragment property to true. When DontFragment is true and the total packet size exceeds the maximum packet size that can be transmitted by one of the routing nodes between the local and remote computers, the ICMP echo request fails. When this happens, the Status is set to PacketTooBig.

The packet or packet fragments can be forwarded by routing nodes 128 times before being discarded. To change this setting, use a Send overload that takes an options parameter, and set the Ttl property to the desired value. If the packet does not reach its destination after being forwarded the specified number of times, the packet is discarded and the ICMP echo request fails. When this happens, the Status is set to TtlExpired.

For an example that demonstrates how to call a Send overload, see the Ping class overview.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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