NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", true); //Remove this line
NetworkShare.ConnectToShare(@"\\server-a\DBFiles", "user1", "password1!"); //Connect with the new credentials

File.Copy(@"c:\temp\T1.txt", @"\\server-a\DBFiles\T1.txt");

NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", false); //Remove this line also

После 02-дневного поиска в Google, наконец, выше это работало для меня. Если вы используете «NetworkShare.DisconnectFromShare» после первого входа, вы получите сообщение об ошибке как 'Access denied'. Затем каждый раз, когда вам нужно перезапустить сервер или нужно выполнить команду 'net use * /del', чтобы удалить сохраненные учетные данные в окнах.

Вы можете использовать олицетворение для изменения пользовательского контекста потоков:

[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword,
    int dwLogonType, int dwLogonProvider, out SafeTokenHandle phToken);
...
LogonUser(userName, domainName, password,
            LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
            out safeTokenHandle);
...
using (WindowsIdentity newId = new WindowsIdentity(safeTokenHandle.DangerousGetHandle()))
            {
                using (WindowsImpersonationContext impersonatedUser = newId.Impersonate())
                {

                    // Check the identity.
                    Console.WriteLine("After impersonation: "
                        + WindowsIdentity.GetCurrent().Name);
                    //Do your coping here
                }
            }

MSDN Пример windowsimpersonationcontext

Я сделал копию этого файла с удаленного сервера. пожалуйста, найдите код.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Security.Principal;
using System.Runtime.InteropServices;
namespace IMPolicy
{
public partial class ExtractData : System.Web.UI.Page
{
    [DllImport("advapi32.DLL", SetLastError = true)]
    public static extern int LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
    protected void Page_Load(object sender, EventArgs e)
    {            

        AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

        IntPtr token = default(IntPtr);
        if (LogonUser("UserName", "Domain", "Password", 2, 0, ref token) != 0)
        {

            WindowsIdentity identity = new WindowsIdentity(token);
            WindowsImpersonationContext context = identity.Impersonate();

            try
            {                
                File.Copy(@"\\\\10.10.38.25\d$\\Sourav\\Draft Report ITC-LRBD_Online Booking Portal_12082016.pdf", @"d:\\Draft Report ITC-LRBD_Online Booking Portal_12082016.pdf", true);
             }
             finally
             {
                 context.Undo();
             }
        }




    }


  }
}

Еще один вариант - вы можете программно получить доступ к NET USE api окон и пройти проверку подлинности на общий ресурс, как если бы вы отправились к нему в проводник и набрали доверенных лиц.

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
}

Вы используете его просто как

DisconnectFromShare(@"\\server-a\DBFiles", true); //Disconnect in case we are currently connected with our credentials;

ConnectToShare(@"\\server-a\DBFiles", username, password); //Connect with the new credentials

if (!Directory.Exists(@"\\server-a\DBFiles\"))
    Directory.CreateDirectory(@"\\server-a\DBFiles\"+Test);   
File.Copy("C:\Temp\abc.txt", @"\\server-a\DBFiles\");

DisconnectFromShare(@"\\server-a\DBFiles", false); //Disconnect from the server.