Yaulw/Net/IPHostHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using Yaulw.Win32;
using System.Management;
using System.IO;

namespace Yaulw.Net
{
    /// <summary>
    /// Helper for common IP / Host Machine
    /// </summary>
    public static class IPHostHelper
    {
        #region Public consts
        
        /// <summary>
        /// This automation URL used to work, now it no longer works :(
        /// Caller must set this before calling ExternalIP() Functions
        /// </summary>
        public static string WHAT_IS_MY_IP_AUTOMATION_URL = "http://automation.whatismyip.com/n09230945.asp";

        #endregion

        #region IPv4 Checkers

        /// <summary>
        /// Checks to see that the passed in ip is a valid Local IP
        /// address that is of version 4 and not a broadcast/loopback/None
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="bAllowLoopback">true to allow Loopback address as valid Local IP</param>
        /// <returns></returns>
        /// <remarks>
        /// IPAddress.IPv6Any = "::";
        /// IPAddress.Any = "0.0.0.0"
        /// IPAddress.Broadcast = "255.255.255.255"
        /// IPAddress.None = "255.255.255.255"     
        /// IPAddress.Loopback = "127.0.0.1"
        /// </remarks>
        public static bool IsValidIPv4Address(IPAddress ip, bool bAllowLoopback)
        {
            if (ip != null)
            {
                if (ip.AddressFamily != AddressFamily.InterNetwork)
                    return false;
                if (ip.AddressFamily.ToString().Contains(IPAddress.IPv6Any.ToString()))
                    return false;
                if (ip == IPAddress.Any)
                    return false;
                if (ip == IPAddress.Broadcast)
                    return false;
                if (ip == IPAddress.None)
                    return false;
                
                // Loopback technically is a valid Local IP that can be used to communicate
                // to ourselves (on the same machine)
                if (ip == IPAddress.Loopback)
                    return bAllowLoopback;

                // This must be a valid local IPv4
                return true;
            }
            return false;            
        }

        /// <summary>
        /// Checks to see if the passed in ip is in a valid Private subnet (i.e. not public)
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        /// <remarks>
        /// Private subnets as defined in <seealso cref="http://tools.ietf.org/html/rfc1918"/>
        /// Loopback address 127.0.0.1/8 <seealso cref="http://tools.ietf.org/html/rfc3330"/>
        /// Zeroconf/bonjour self assigned addresses 169.254.0.0/16 <seealso cref="http://tools.ietf.org/html/rfc3927"/>
        /// </remarks>
        public static bool IsIPv4AddressInPrivateSubnet(IPAddress ip)
        {
            if (!IsValidIPv4Address(ip, true)) 
                return false;
            
            String[] netAddrs = { "192.168.0.0", "10.0.0.0", "172.16.0.0", "127.0.0.1", "169.254.0.0" };
            String[] netMasks = { "255.255.0.0", "255.0.0.0", "255.240.0.0", "255.0.0.0", "255.255.0.0" };

            UInt32 myIP = BitConverter.ToUInt32(ip.GetAddressBytes(), 0);
            for (int i = 0; i < netMasks.Length; i++)
            {
                IPAddress netAddr = IPAddress.Parse(netAddrs[i]);
                UInt32 netIP = BitConverter.ToUInt32(netAddr.GetAddressBytes(), 0);

                IPAddress maskAddr = IPAddress.Parse(netMasks[i]);
                UInt32 maskIP = BitConverter.ToUInt32(maskAddr.GetAddressBytes(), 0);

                if ((myIP & maskIP) == (netIP & maskIP))
                    return true;
            }
            return false;
        }

        /// <summary>
        /// Compares two IP Addresses, if the Left One is different from the right one, assigns
        /// the right one to the LeftOrRight (simple) and returns true. Otherwise assigns left to it and returns false.
        /// </summary>
        public static bool AreIPAddressesDifferent(IPAddress left, IPAddress right, out IPAddress LeftOrRight)
        {
            LeftOrRight = left;
            if (left != null && right != null)
            {
                if (String.Compare(left.ToString(), right.ToString(), true) != 0)
                {
                    LeftOrRight = right;
                    return true;
                }
            }
            else if (left == null && right != null)
            {
                LeftOrRight = right;
                return true;
            }
            return false;
        }

        #endregion

        #region Connectivity

        /// <summary>
        /// Method to check if the Local Computer has a valid Network Connection
        /// </summary>
        /// <returns></returns>
        public static bool HasConnection()
        {
            //instance of our ConnectionStatusEnum
            Definitions.ConnectionStatusEnum state = 0;

            //call the API
            bool bIsConnected = Wininet.InternetGetConnectedState(ref state, 0);
            if (!bIsConnected)
                return false;

            //check the status, if in offline mode then return false
            if (((int)Definitions.ConnectionStatusEnum.INTERNET_CONNECTION_OFFLINE & (int)state) != 0)
                return false;

            return true;
        }

        /// <summary>
        /// Method to check to see if local Computer has a valid Network connection
        /// and can open the specified ip and port
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool HasConnectivity(IPAddress ip, uint port)
        {
            if(HasConnection() && IsValidIPv4Address(ip, true) && port > 0)
                return IsPortOpen(ip, (int) port);
            return false;
        }

        /// <summary>
        /// Method to check to see if local Computer has a valid Network connection
        /// and can open the specified host and port
        /// </summary>
        /// <param name="host"></param>
        /// <param name="port"></param>
        /// <param name="nTimeout"></param>
        /// <returns></returns>
        public static bool HasConnectivity(string host, uint port, int nTimeout)
        {
            if (HasConnection() && port > 0)
            {
                IPAddress ip = GetIpForHost(host);
                if(ip != IPAddress.None && IsValidIPv4Address(ip, false))
                    return IsPortOpen(ip, (int) port, nTimeout);
            }            
            return false;
        }

        /// <summary>
        /// Retrieves the Servername from a DataBaseConnectionString, if possible,
        /// then gets the ip for the server name and tries to open up the port specified
        /// </summary>
        /// <param name="DataBaseConnectionString">pass in either a DataSource or ConnectionString</param>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool HasConnectivity(string DataBaseConnectionString, uint port)
        {
            if (HasConnection() && !String.IsNullOrEmpty(DataBaseConnectionString))
            {
                // Allow the SharedConnectionDataSource to be a ConnectionString also via calling GetDataSource()
                DataBaseConnectionString = GetDataSource(DataBaseConnectionString);

                // Retrieve the IP for the Data Source and test the ip and set it in the API
                string host = GetServerNameFromADataSource(DataBaseConnectionString);
                IPAddress ip = GetIpForHost(host);
                if (ip != IPAddress.None)
                {
                    if (IsPortOpen(ip, (int) port))
                        return true;
                }
            }
            return false;
        }        

        #endregion

        #region Core IPHostHelper Functionallity

        /// <summary>
        /// Converts all incl. Loopback, if contained, valid IP addresses into a String array of IPs
        /// </summary>
        /// <returns></returns>
        public static string[] ConvertIPArrayToStringArray(IPAddress[] IPs)
        {
            List<string> ips = new List<string>();
            if (IPs != null && IPs.Length > 0)
            {                
                foreach (IPAddress ip in IPs)
                {
                    if (IsValidIPv4Address(ip, true))
                        ips.Add(ip.ToString());
                }
            }
            return ips.ToArray(); 
        }

        /// <summary>
        /// Get all valid IPv4 Local IP addresses besides the loopback address
        /// </summary>
        /// <returns></returns>
        public static IPAddress[] GetAllLocalIPAddresses()
        {
            // Get host name
            String HostName = Dns.GetHostName();
            IPHostEntry iphostentry = Dns.GetHostEntry(HostName);

            // Enumerate IP addresses            
            List<IPAddress> IPs = new List<IPAddress>();
            foreach (IPAddress ipaddress in iphostentry.AddressList)
            {
                if (IsValidIPv4Address(ipaddress, false))
                    IPs.Add(ipaddress);
            }

            // Return them as a string[] of IPs
            return IPs.ToArray();
        }

        /// <summary>
        /// Get First Found Local IP Address (or IPAddress.None, if none found)
        /// </summary>
        /// <returns>get the first Local IP Address found</returns>
        public static IPAddress GetFirstLocalIPAddress()
        {
            IPAddress[] IPs = GetAllLocalIPAddresses();
            if (IPs.Length > 0)
                return IPs[0];
            else
                return IPAddress.None;
        }

        /// <summary>
        /// Get Nth Found Local IP Address (or first one found, if n > IPs Found)
        /// (or IPAddress.None, if none found)
        /// </summary>
        /// <returns>get the Nth Local IP Address found</returns>
        public static IPAddress GetNthLocalIPAddress(int n)
        {
            IPAddress[] IPs = GetAllLocalIPAddresses();
            if (n >= 0 && IPs.Length < n)
                return IPs[n];
            else if (IPs.Length > 0)
                return IPs[0];
            else
                return IPAddress.None;
        }

        /// <summary>
        /// Check to see if the host passed in is Local
        /// </summary>
        /// <param name="host">can be ip or host name</param>
        /// <returns>true, if host or ip is local, false otherwise</returns>
        /// <exception cref="ArgumentException">When host is empty</exception>
        public static bool IsHostOrIPLocal(string host)
        {
            if (!String.IsNullOrEmpty(host))
            {
                IPAddress ip = null;
                if (IPAddress.TryParse(host, out ip))
                {
                    IPAddress[] localIPs = GetAllLocalIPAddresses();
                    foreach(IPAddress localip in localIPs)
                    {
                        if (localip == ip)
                            return true;
                    }
                    return false;
                }
                else
                {
                    return (String.Compare(host.Trim(), Dns.GetHostName(), true) == 0);
                }
            }
            throw new ArgumentException("Invalid host");
        }

        /// <summary>
        /// Method for resolving a Host (DNS Resolve)
        /// </summary>
        /// <param name="host">the host</param>
        /// <param name="bMustBeInPrivateIPRange">Set to true, if the host must be in the Private IP Range</param>
        /// <returns>true, if host can be resolved to an IP Address, false otherwise</returns>
        public static bool CanResolveHost(string host, bool bMustBeInPrivateIPRange)
        {
            if(!String.IsNullOrEmpty(host))
            {
                IPAddress ip = GetIpForHost(host);
                if (bMustBeInPrivateIPRange)
                    return IsIPv4AddressInPrivateSubnet(ip);
                return (ip != IPAddress.None);
            }
            return false;
        }

        /// <summary>
        /// Method for retrieving the IP address for a Host (DNS Resolve)
        /// </summary>
        /// <param name="host">the host we need the ip address for</param>
        /// <returns>an IPAddress if found, otherwise IPAddress.None</returns>
        public static IPAddress GetIpForHost(string host)
        {
            //variable to hold our error message (if something fails)
            string errMessage = string.Empty;

            //IPAddress instance for holding the returned host
            IPAddress address = IPAddress.None;

            //wrap the attempt in a try..catch to capture
            //any exceptions that may occur
            try
            {
                // if it's already an ip address being passed in,
                // we are done
                if (!IPAddress.TryParse(host, out address))
                {
                    //get the host IP from the name provided
                    address = Dns.GetHostEntry(host).AddressList[0];

                    // We must be called for the local host, that
                    // could explain why it is not a valid IP
                    if (!IsValidIPv4Address(address, false))
                        address = GetFirstLocalIPAddress();                    
                }
                else
                {
                    address = IPAddress.Parse(host);
                }
            }
            catch (Exception) { /* ignore */ }
            if (address == null)
                return IPAddress.None;
            else
                return address;
        }

        /// <summary>
        /// Ping a host
        /// </summary>
        /// <param name="host">url/host/ip</param>
        /// <param name="nTimeout">timeout value in miliseconds</param>
        /// <param name="nTrys">number of times to ping</param>
        /// <returns>the number of successful pings</returns>
        public static int PingHost(string host, int nTimeout, int nTrys)
        {
            //string to hold our return messge
            //string returnMessage = string.Empty;

            // Check to see if the host passed in is an IP Address            
            // otherwise, just resolve the host
            IPAddress address = null;
            if(!IPAddress.TryParse(host, out address))                                            
               address = GetIpForHost(host);

            // Error occured resolving host
            if (!IsValidIPv4Address(address, false))
                return 0;

            //set the ping options, TTL 128
            PingOptions pingOptions = new PingOptions(128, true);

            //create a new ping instance
            Ping ping = new Ping();

            //32 byte buffer (create empty)
            byte[] buffer = new byte[32];

            //first make sure we actually have an internet connection
            int nPingSuccess = 0;
            if (HasConnection())
            {
                //here we will ping the host nTrys times                
                for (int i = 0; i < nTrys; i++)
                {
                    try
                    {                
                        PingReply pingReply = ping.Send(address, nTimeout, buffer, pingOptions);                     
                        if (!(pingReply == null))
                        {
                            switch (pingReply.Status)
                            {
                                case IPStatus.Success:
                                    nPingSuccess++;
                                    break;
                                case IPStatus.TimedOut:                                    
                                default:                                    
                                    break;
                            }
                        }                        
                    }
                    catch (Exception) { /* ignore and continue iterating */ }                    
                }
            }
            return nPingSuccess;
        }

        #endregion

        #region Port Open

        /// <summary>
        /// Check to see if a port is open for the specified ip
        /// </summary>
        /// <param name="host"></param>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool IsPortOpen(IPAddress ip, int port)
        {
            bool bCanConnect = false;
            if (IsValidIPv4Address(ip, true) && port > 0)
            {
                try
                {
                    TcpClient tcP = new System.Net.Sockets.TcpClient();
                    tcP.Connect(ip, port);
                    bCanConnect = true;
                    tcP.Close();
                }
                catch (Exception) { /* ignore */ }
            }
            return bCanConnect;
        }

        /// <summary>
        /// Check to see if a port is open for the specified ip
        /// </summary>
        /// <param name="host"></param>
        /// <param name="port"></param>
        /// <returns></returns>
        public static bool IsPortOpen(IPAddress ip, int port, int nTimeout)
        {
            bool bCanConnect = false;
            if (IsValidIPv4Address(ip, true) && port > 0)
            {
                try
                {
                    TcpClient tcP = new System.Net.Sockets.TcpClient();
                    if (nTimeout > 0)
                        tcP.ReceiveTimeout = nTimeout;
                    tcP.Connect(ip, port);
                    bCanConnect = true;
                    tcP.Close();
                }
                catch (Exception) { /* ignore */ }
            }
            return bCanConnect;
        }

        #endregion

        #region Get External IP

        /// <summary>
        /// Get the External IP
        /// </summary>
        /// <param name="pTimeOutMiliSeconds">Timeout in MiliSeconds</param>
        /// <returns>a valid external IPAddress or IPAddress.None, if error occured</returns>
        public static IPAddress GetExternalIP(int pTimeOutMiliSeconds)
        {
            IPAddress extIP = IPAddress.None;
            try
            {
                using (WebClient wc = new WebClient())
                {
                    wc.Headers.Add("user-agent", WCHelper.USER_AGENT_GENERIC);
                    UTF8Encoding utf8 = new UTF8Encoding();
                    string ipaddr = null;
                    bool done = false;

                    wc.DownloadDataCompleted += new
                    DownloadDataCompletedEventHandler((object sender,
                               DownloadDataCompletedEventArgs e) =>
                    {
                        ipaddr = utf8.GetString(e.Result);
                        done = true;
                    });

                    wc.DownloadDataAsync(new Uri(WHAT_IS_MY_IP_AUTOMATION_URL));
                    System.DateTime startTime = System.DateTime.Now;
                    while (!done)
                    {
                        System.TimeSpan sp = System.DateTime.Now - startTime;

                        // We should get a response in less than timeout.
                        // If not, we cancel all and return the internal IP Address
                        if (sp.TotalMilliseconds > pTimeOutMiliSeconds)
                        {
                            done = true;
                            wc.CancelAsync();
                        }
                    }
                    
                    if (IPAddress.TryParse(ipaddr, out extIP))
                        return extIP;
                }
            }
            catch { /* ignore */ }
            return IPAddress.None;
        }

        /// <summary>
        /// Get the External IP
        /// </summary>
        /// <returns>a valid external IPAddress or IPAddress.None, if error occured</returns>
        public static IPAddress GetExternalIP()
        {
            string ipaddr = WCHelper.ScreenScrapeFromURL(WHAT_IS_MY_IP_AUTOMATION_URL);
            IPAddress extIP = IPAddress.None;
            if (IPAddress.TryParse(ipaddr, out extIP))
                return extIP;
            return IPAddress.None;
        }

        /// <summary>
        /// Call this to retrieve the external IP Address (also makes sure we can connect
        /// to WhatIsMyIp site)
        /// </summary>        
        /// <param name="bForceMultipleChecks">
        /// Forces 4 checks at 2.5/5.0/7.5/10 seconds timeout values
        /// otherwise makes one request defaulting to 5.0
        /// </param>
        /// <returns>valid external IP Address or null if not found</returns>        
        public static IPAddress GetExternalIP(bool bForceMultipleChecks)
        {
            if (HasConnection())
            {
                IPAddress ipExtIP = null;
                if (bForceMultipleChecks)
                {                    
                    // Check with an timout of 2.5/5.0/7.5/10 seconds
                    for (int n = 2500; n <= 10000; n = n + 2500)
                    {
                        ipExtIP = GetExternalIP(n);   
                        if(ipExtIP != IPAddress.None)                     
                           return ipExtIP;
                    }
                }
                else
                {                 
                    // Check with whatever is the default timeout                    
                    ipExtIP = Yaulw.Net.IPHostHelper.GetExternalIP(5000);                    
                    return ipExtIP;
                }
            }
            return IPAddress.None;
        }

        #endregion

        #region UNC and Path Related Windows Network Helpers

        /// <summary>
        /// Allows us to use either pass in a ConnectionString or a DataSource * Added flexibility *
        /// will return the DataSource part of the connection string, if exists, otherwise the connection string
        /// </summary>
        /// <param name="DataBaseConnectionString">pass in either a DataSource or ConnectionString</param>
        /// <returns></returns>
        public static string GetDataSource(string DataBaseConnectionString)
        {
            if (IsDataBaseConnectionString(DataBaseConnectionString))
            {
                String[] tokens = DataBaseConnectionString.Split(';');
                foreach (string Pair in tokens)
                {
                    string[] KeyValuePair = Pair.Split('=');
                    try
                    {
                        string left = KeyValuePair[0];
                        string right = KeyValuePair[1];
                        string FoundValue = "";
                        if (String.Compare(KeyValuePair[0].ToUpper().Trim(), "DATA SOURCE", true) == 0)
                        {
                            if (!String.IsNullOrEmpty(right))
                            {
                                FoundValue = right.Trim();
                                return FoundValue;
                            }
                        }

                    }
                    catch (Exception) { /* ignore and continue iteration */ }
                }
            }

            // Migth still be a data source just not from a Connection string
            // so just return the value trimmed
            if (!String.IsNullOrEmpty(DataBaseConnectionString))
                return DataBaseConnectionString.Trim();
            else
                return String.Empty;
        }

        /// <summary>
        /// Quick Check to see if a connection string is valid * must have DataSource Key and 
        /// a Value * in order to be considered a valid Connection String
        /// </summary>
        /// <param name="ConnectionString"></param>
        /// <returns></returns>
        public static bool IsDataBaseConnectionString(string ConnectionString)
        {
            if (!String.IsNullOrEmpty(ConnectionString) &&
                ConnectionString.ToUpper().Contains("DATA SOURCE") &&
                ConnectionString.Contains("="))
            {
                String[] tokens = ConnectionString.Split(';');
                foreach (string Pair in tokens)
                {
                    string[] KeyValuePair = Pair.Split('=');
                    try
                    {
                        string left = KeyValuePair[0];
                        string right = KeyValuePair[1];
                        if (String.Compare(KeyValuePair[0].ToUpper().Trim(), "DATA SOURCE", true) == 0)
                            return !String.IsNullOrEmpty(right);
                    }
                    catch (Exception) { /* ignore and continue iteration */ }
                }
                return true;
            }
            return false;
        }

        /// <summary>
        /// Returns the Server Name from a Database DataSource Connection String
        /// </summary>
        /// <param name="DataSource">        
        /// [DriveLetter]:\{SomeFileNameNPath}
        /// \\{Server]\{SomeFileNameNPath}
        /// \\{Server]:[Port]\{SomeFileNameNPath}
        /// [Server]\Instance
        /// [Server]
        /// </param>
        /// <remarks>Server string returned can be a name or an IP address</remarks>
        /// <returns>Server Host Name or IP</returns>
        public static string GetServerNameFromADataSource(string DataSource)
        {
            if (!String.IsNullOrEmpty(DataSource))
            {

                // Always strip out port in the DataSource *before doing anything*
                // only do this for non-local paths
                if (DataSource.Contains(":") && DataSource[1] != ':')
                {
                    int nLoc = DataSource.IndexOf(":");
                    if (nLoc != -1)
                        DataSource = DataSource.Substring(0, nLoc);
                }

                // Let's begin ...
                string Server = String.Empty;

                // Local Medisoft
                bool bIsLocalFilePath = DataSource.Contains(@":\");
                if (bIsLocalFilePath)
                {
                    string PathInCaseMapped = ResolveToUNCIfNeeded(DataSource);

                    // It's a local or a UNC path
                    if (!PathInCaseMapped.StartsWith(@"\\"))
                    {
                        // If Local file that the host is this computer
                        return Dns.GetHostName();
                    }
                    else
                    {
                        // else it's the other host * so follow UNC logic *
                        // Stripe out first 2 chars
                        Server = PathInCaseMapped.Substring(2);

                        // Stripe out the rest
                        int nLoc = Server.IndexOf(@"\");
                        if (nLoc != -1)
                            Server = Server.Substring(0, nLoc);
                    }
                }

                // Remote Medisoft
                bool bIsNetworkFilePath = DataSource.StartsWith(@"\\");
                if (bIsNetworkFilePath)
                {
                    // Stripe out first 2 chars
                    Server = DataSource.Substring(2);

                    // Stripe out the rest
                    int nLoc = Server.IndexOf(@"\");
                    if (nLoc != -1)
                        Server = Server.Substring(0, nLoc);
                }

                // It's Lytec! :)
                bool bIsSQLServerInstance = !bIsLocalFilePath && !bIsNetworkFilePath;
                if (bIsSQLServerInstance)
                {
                    // Stripe out Instance, if it exists
                    int nLoc = DataSource.IndexOf(@"\");
                    if (nLoc != -1)
                        Server = DataSource.Substring(0, nLoc);
                    else
                        Server = DataSource;
                }

                return Server;
            }
            return String.Empty;
        }

        /// <summary>
        /// Determines if the passed in string is a connection string or a data Source
        /// and tries to make the best of things to retrieve the host/server name
        /// </summary>
        /// <param name="ConnectionString"></param>
        /// <returns></returns>
        public static string GetServerNameFromAConnectionString(string ConnectionString)
        {
            if (IsDataBaseConnectionString(ConnectionString))
            {
                string DataSource = GetDataSource(ConnectionString);
                return GetServerNameFromADataSource(DataSource);
            }
            else
            {
                // Pretentd that it is just a DataSource
                return GetServerNameFromADataSource(ConnectionString);
            }
        }

        /// <summary>Resolves the given path to a UNC path, or local drive path.</summary>
        /// <param name="pPath"></param>
        /// <returns>\\server\share\[path] OR [driveletter]:\[path]</returns>
        public static string ResolveToUNCIfNeeded(string pPath)
        {
            if (String.IsNullOrEmpty(pPath))
                return String.Empty;

            ManagementObject mo = new ManagementObject();

            // Already UNC, we are done here
            if (pPath.StartsWith(@"\\")) { return pPath; }

            // Get just the drive letter for WMI call
            string driveletter = GetDriveLetter(pPath);            

            mo.Path = new ManagementPath(string.Format("Win32_LogicalDisk='{0}'", driveletter));

            // Get the data we need
            uint DriveType = System.Convert.ToUInt32(mo["DriveType"]);
            string NetworkRoot = System.Convert.ToString(mo["ProviderName"]);
            mo = null;

            // Return the root UNC path if network drive, otherwise return the root path to the local drive
            if (DriveType == 4)
            {
                return NetworkRoot + pPath.Substring(2);
            }
            else
            {
                return driveletter + pPath.Substring(2);
            }
        }

        /// <summary>Checks if the given path is on a network drive.</summary>
        /// <param name="pPath"></param>
        /// <returns></returns>
        public static bool isNetworkDrive(string pPath)
        {
            ManagementObject mo = new ManagementObject();

            if (pPath.StartsWith(@"\\")) { return true; }

            // Get just the drive letter for WMI call
            string driveletter = GetDriveLetter(pPath);

            mo.Path = new ManagementPath(string.Format("Win32_LogicalDisk='{0}'", driveletter));

            // Get the data we need
            uint DriveType = System.Convert.ToUInt32(mo["DriveType"]);
            mo = null;

            return DriveType == 4;
        }

        #endregion

        #region Private Helpers

        /// <summary>Given a path will extract just the drive letter with volume separator.</summary>
        /// <param name="pPath"></param>
        /// <returns>C:</returns>
        private static string GetDriveLetter(string pPath)
        {
            if (pPath.StartsWith(@"\\")) { throw new ArgumentException("A UNC path was passed to GetDriveLetter"); }
            return Directory.GetDirectoryRoot(pPath).Replace(Path.DirectorySeparatorChar.ToString(), "");
        }

        #endregion
    }
}