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copied!<p>I'm not sure if GetDiskFreeSpaceEx works on UNC shares, but if it does use that, otherwise here is how to mount a UNC share to a logal drive:</p> <p><strong>EDIT</strong> GetDiskFreeSpaceEx does work on UNC shares, use that...however, this code was too much effort to just delete, and is handy if you ever want to mount a UNC share as a local drive in your code.</p> <pre><code>public class DriveWrapper { [StructLayout(LayoutKind.Sequential)] public struct NETRESOURCEA { public int dwScope; public int dwType; public int dwDisplayType; public int dwUsage; [MarshalAs(UnmanagedType.LPStr)] public string lpLocalName; [MarshalAs(UnmanagedType.LPStr)] public string lpRemoteName; [MarshalAs(UnmanagedType.LPStr)] public string lpComment; [MarshalAs(UnmanagedType.LPStr)] public string lpProvider; public override String ToString() { String str = "LocalName: " + lpLocalName + " RemoteName: " + lpRemoteName + " Comment: " + lpComment + " lpProvider: " + lpProvider; return (str); } } [DllImport("mpr.dll")] public static extern int WNetAddConnection2A( [MarshalAs(UnmanagedType.LPArray)] NETRESOURCEA[] lpNetResource, [MarshalAs(UnmanagedType.LPStr)] string lpPassword, [MarshalAs(UnmanagedType.LPStr)] string UserName, int dwFlags); [DllImport("mpr.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)] private static extern int WNetCancelConnection2A( [MarshalAs(UnmanagedType.LPStr)] string lpName, int dwFlags, int fForce ); public int GetDriveSpace(string shareName, string userName, string password) { NETRESOURCEA[] n = new NETRESOURCEA[1]; n[0] = new NETRESOURCEA(); n[0].dwScope = 0; n[0].dwType = 0; n[0].dwDisplayType = 0; n[0].dwUsage = 0; n[0].dwType = 1; n[0].lpLocalName = "x:"; n[0].lpRemoteName = shareName; n[0].lpProvider = null; int res = WNetAddConnection2A(n, userName, password, 1); DriveInfo info = new DriveInfo("x:"); int space = info.AvailableFreeSpace; int err = 0; err = WNetCancelConnection2A("x:", 0, 1); return space; } } </code></pre>

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