Copiar archivos con autenticación en C#

Agregar el namespace:
using System.Runtime.InteropServices;
public static class NetworkShare { /// <summary> /// Connects to the remote share /// </summary> /// <returns>Null if successful, otherwise error message.</returns> public static string ConnectToShare(string uri, string username, string password) { //Create netresource and point it at the share NETRESOURCE nr = new NETRESOURCE(); nr.dwType = RESOURCETYPE_DISK; nr.lpRemoteName = uri; //Create the share int ret = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null); //Check for errors if (ret == NO_ERROR) return null; else return GetError(ret); } /// <summary> /// Remove the share from cache. /// </summary> /// <returns>Null if successful, otherwise error message.</returns> public static string DisconnectFromShare(string uri, bool force) { //remove the share int ret = WNetCancelConnection(uri, force); //Check for errors if (ret == NO_ERROR) return null; else return GetError(ret); } #region P/Invoke Stuff [DllImport("Mpr.dll")] private static extern int WNetUseConnection( IntPtr hwndOwner, NETRESOURCE lpNetResource, string lpPassword, string lpUserID, int dwFlags, string lpAccessName, string lpBufferSize, string lpResult ); [DllImport("Mpr.dll")] private static extern int WNetCancelConnection( string lpName, bool fForce ); [StructLayout(LayoutKind.Sequential)] private class NETRESOURCE { public int dwScope = 0; public int dwType = 0; public int dwDisplayType = 0; public int dwUsage = 0; public string lpLocalName = ""; public string lpRemoteName = ""; public string lpComment = ""; public string lpProvider = ""; } #region Consts const int RESOURCETYPE_DISK = 0x00000001; const int CONNECT_UPDATE_PROFILE = 0x00000001; #endregion #region Errors const int NO_ERROR = 0; const int ERROR_ACCESS_DENIED = 5; const int ERROR_ALREADY_ASSIGNED = 85; const int ERROR_BAD_DEVICE = 1200; const int ERROR_BAD_NET_NAME = 67; const int ERROR_BAD_PROVIDER = 1204; const int ERROR_CANCELLED = 1223; const int ERROR_EXTENDED_ERROR = 1208; const int ERROR_INVALID_ADDRESS = 487; const int ERROR_INVALID_PARAMETER = 87; const int ERROR_INVALID_PASSWORD = 1216; const int ERROR_MORE_DATA = 234; const int ERROR_NO_MORE_ITEMS = 259; const int ERROR_NO_NET_OR_BAD_PATH = 1203; const int ERROR_NO_NETWORK = 1222; const int ERROR_SESSION_CREDENTIAL_CONFLICT = 1219; const int ERROR_BAD_PROFILE = 1206; const int ERROR_CANNOT_OPEN_PROFILE = 1205; const int ERROR_DEVICE_IN_USE = 2404; const int ERROR_NOT_CONNECTED = 2250; const int ERROR_OPEN_FILES = 2401; private struct ErrorClass { public int num; public string message; public ErrorClass(int num, string message) { this.num = num; this.message = message; } } private static ErrorClass[] ERROR_LIST = new ErrorClass[] { new ErrorClass(ERROR_ACCESS_DENIED, "Error: Access Denied"), new ErrorClass(ERROR_ALREADY_ASSIGNED, "Error: Already Assigned"), new ErrorClass(ERROR_BAD_DEVICE, "Error: Bad Device"), new ErrorClass(ERROR_BAD_NET_NAME, "Error: Bad Net Name"), new ErrorClass(ERROR_BAD_PROVIDER, "Error: Bad Provider"), new ErrorClass(ERROR_CANCELLED, "Error: Cancelled"), new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"), new ErrorClass(ERROR_INVALID_ADDRESS, "Error: Invalid Address"), new ErrorClass(ERROR_INVALID_PARAMETER, "Error: Invalid Parameter"), new ErrorClass(ERROR_INVALID_PASSWORD, "Error: Invalid Password"), new ErrorClass(ERROR_MORE_DATA, "Error: More Data"), new ErrorClass(ERROR_NO_MORE_ITEMS, "Error: No More Items"), new ErrorClass(ERROR_NO_NET_OR_BAD_PATH, "Error: No Net Or Bad Path"), new ErrorClass(ERROR_NO_NETWORK, "Error: No Network"), new ErrorClass(ERROR_BAD_PROFILE, "Error: Bad Profile"), new ErrorClass(ERROR_CANNOT_OPEN_PROFILE, "Error: Cannot Open Profile"), new ErrorClass(ERROR_DEVICE_IN_USE, "Error: Device In Use"), new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"), new ErrorClass(ERROR_NOT_CONNECTED, "Error: Not Connected"), new ErrorClass(ERROR_OPEN_FILES, "Error: Open Files"), new ErrorClass(ERROR_SESSION_CREDENTIAL_CONFLICT, "Error: Credential Conflict"), }; private static string GetError(int errNum) { foreach (ErrorClass er in ERROR_LIST) { if (er.num == errNum) return er.message; } return "Error: Unknown, " + errNum; } #endregion #endregion }
y finalmente así se utilizaría:
ConnectToShare(@"\\NombreServidor\Carpeta", username, password); Test="HOLA" if (!Directory.Exists(@"\\NombreServidor\Carpeta\")) Directory.CreateDirectory(@"\\NombreServidor\Carpeta\"+Test); File.Copy("C:\MiCarpeta\archivo.txt", @"\\NombreServidor\Carpeta\"); DisconnectFromShare(@"\\NombreServidor\Carpeta", false);