/// <summary>
/// Determines whether the IP address is in the same subnet as the
/// specified IP address.
/// </summary>
/// <param name="address">The IPAddress instance this is being called
/// for.</param>
/// <param name="other">The IP address to determine whether it is in the same
/// subnet.</param>
/// <param name="netmask">The subnetmask to apply.</param>
/// <returns>true if both IP address are located in the same subnet; Otherwise
/// false.</returns>
/// <exception cref="ArgumentNullException">The other parameter or the netmask
/// parameter is null.</exception>
/// <exception cref="ArgumentException">The netmask and IP address must be
/// of the same address family.</exception>
/// <remarks>This is an extension method for the IPAddress class.</remarks>
public static bool InSameSubnet(this IPAddress address, IPAddress other,
IPAddress netmask) {
other.ThrowIfNull("other");
netmask.ThrowIfNull("netmask");
return address.And(netmask).Equals(other.And(netmask));
}