C# TCP Socket Keep Alive Extensions

SocketKeepAlive.cs

using System.Net.Sockets;
using System.Runtime.InteropServices;

namespace SocketKeepAlive
{
    public static class SocketKeepAlive
    {
        public static void SetKeepAlive(this Socket socket, bool enabled, int keepalivetime, int interval)
        {
            int size = Marshal.SizeOf((uint)0);
            byte[] keepAlive = new byte[size * 3];

            Buffer.BlockCopy(BitConverter.GetBytes((uint)(enabled ? 1 : 0)), 0, keepAlive, 0, size);
            Buffer.BlockCopy(BitConverter.GetBytes((uint)keepalivetime), 0, keepAlive, size, size);
            Buffer.BlockCopy(BitConverter.GetBytes((uint)interval), 0, keepAlive, size * 2, size);

            socket.IOControl(IOControlCode.KeepAliveValues, keepAlive, null);
        }

        public static void EnableKeepAlive(this Socket socket, byte retryCount, int keepAliveTimeInSeconds, int keepAliveIntervalInSeconds)
        {
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
            socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveRetryCount, (int)retryCount);
            socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveTime, keepAliveTimeInSeconds);
            socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveInterval, keepAliveIntervalInSeconds);
        }

        public static void DisableKeepAlive(this Socket socket)
        {
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, false);
        }
    }
}