/// <summary>
        /// Creates a new firewall rule on the specified server.
        /// </summary>
        /// <param name="proxy">
        /// Channel used for communication with Azure's service management APIs.
        /// </param>
        /// <param name="subscriptionId">
        /// The subscription id which contains the server.
        /// </param>
        /// <param name="serverName">
        /// The name of the server in which to create the firewall rule.
        /// </param>
        /// <param name="ruleName">
        /// The name of the new firewall rule.
        /// </param>
        /// <param name="startIpAddress">
        /// The starting IP address for the firewall rule.
        /// </param>
        /// <param name="endIpAddress">
        /// The ending IP address for the firewall rule.
        /// </param>
        public static void NewServerFirewallRule(this ISqlDatabaseManagement proxy, string subscriptionId, string serverName, string ruleName, string startIpAddress, string endIpAddress)
        {
            var input = new SqlDatabaseFirewallRuleInput
            {
                Name           = ruleName,
                StartIPAddress = startIpAddress,
                EndIPAddress   = endIpAddress
            };

            proxy.EndNewServerFirewallRule(proxy.BeginNewServerFirewallRule(subscriptionId, serverName, input, null, null));
        }