Accessing Network Drive in C#

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

public static class Pathing
{
    [DllImport("mpr.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern int WNetGetConnection(
        [MarshalAs(UnmanagedType.LPTStr)] string localName,
        [MarshalAs(UnmanagedType.LPTStr)] StringBuilder remoteName,
        ref int length);

    /// <summary>
    /// Given a path, returns the UNC path or the original. (No exceptions
    /// are raised by this function directly). For example, "P:\2008-02-29"
    /// might return: "\\networkserver\Shares\Photos\2008-02-09"
    /// </summary>
    /// <param name="originalPath">The path to convert to a UNC Path</param>
    /// <returns>A UNC path. If a network drive letter is specified, the
    /// drive letter is converted to a UNC or network path. If the
    /// originalPath cannot be converted, it is returned unchanged.</returns>
    public static string GetUNCPath(string originalPath)
    {
        StringBuilder sb = new StringBuilder(512);
        int size = sb.Capacity;
        // look for the {LETTER}: combination ...
        if (originalPath.Length > 2 && originalPath[1] == ':')
        {
            // don't use char.IsLetter here - as that can be misleading
            // the only valid drive letters are a-z && A-Z.
            char c = originalPath[0];
            if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
            {
                int error = WNetGetConnection(originalPath.Substring(0, 2),
                    sb, ref size);
                if (error == 0)
                {
                    DirectoryInfo dir = new DirectoryInfo(originalPath);
                    string path = Path.GetFullPath(originalPath)
                        .Substring(Path.GetPathRoot(originalPath).Length);
                    return Path.Combine(sb.ToString().TrimEnd(), path);
                }
            }
        }
        return originalPath;
    }
}

As far as my requirement is considered I have a combo box which is currently used to display all the drives that are there in my computer. Irrespective of whether the drive is a network drive or a local drive the current combo box displays all the drives. My requirement is to only display the network drives that are available there in my system. How do I do this? Thanks to the .NET framework, the DriveInfo class of the framework allows you to search through all the drives that are available on the machine. All that I needed to do was just, run a for each loop which looks for the Drives which are of network type.

Have a look at the following code.

DriveInfo[] allDrives = DriveInfo.GetDrives();
foreach (DriveInfo d in allDrives)
{
    if (d.DriveType == DriveType.Network)
    {
        cmbbxDrive.Items.Add(d.ToString());
    }
}

Doing this will allow me to fetch the only network drives into the combo box. Upon selecting one of the drives the Drive's Letter will be sent as a parameter(LPStr) to the MarshalAs method. The "Mpr.dll" will now do the respective task and return us the string which is essentially the path of the Network Drive and the Folder eg: "\\MyServer\MyFolder".

As per the need one can split the path further and save it into a Database. Otherwise, you can send the one who assigned you the task a message saying "MISSION ACCOMPLISHED".

Hope this is better than the love tips post!