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static extern Int32 IcmpSendEcho(IntPtr icmpHandle, Int32 destinationAddress, IntPtr requestData, Int16 requestSize, IntPtr requestOptions, IntPtr replyBuffer, Int32 replySize, Int32 timeout);

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Declare Function IcmpSendEcho Lib "icmp.dll" (icmpHandle as IntPtr, destinationAddress as Int32, requestData as IntPtr, requestSize as Int16, requestOptions as IntPtr, replyBuffer as IntPtr, replySize as Int32, timeout as Int32) As Int32

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        private static extern int IcmpSendEcho(IntPtr icmpHandle, int destinationAddress, string requestData, short requestSize, ref ICMP_OPTIONS requestOptions, ref ICMP_ECHO_REPLY replyBuffer, int replySize, int timeout);

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            int iReplies = IcmpSendEcho(icmpHandle, BitConverter.ToInt32(ip.GetAddressBytes(), 0), sData, (short)sData.Length, ref icmpOptions, ref icmpReply, Marshal.SizeOf(icmpReply), 30);

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DWORD WINAPI IcmpSendEcho(HANDLE IcmpHandle, IPAddr DestinationAddress,

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    dwRetVal = IcmpSendEcho(hIcmpFile, ipaddr, SendData, sizeof(SendData),

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Documentation

[IcmpSendEcho] on MSDN