.NET (Core and Framework)

string userName = Environment.UserName;
string userDomain = Environment.UserDomainName;

public  void SetFolderPermission(string userName, string fullPath, AccessControlType accessControlType,
                                             FileSystemRights fileAccessPermisson)
      {
          var dInfo = new DirectoryInfo(fullPath);

          DirectorySecurity dSecurity = dInfo.GetAccessControl();
          dSecurity.AddAccessRule(new FileSystemAccessRule(userName, fileAccessPermisson,
                                                           InheritanceFlags.ContainerInherit |
                                                           InheritanceFlags.ObjectInherit, PropagationFlags.None,
                                                           accessControlType));
          dInfo.SetAccessControl(dSecurity);
      }

      public  void RemoveAllFolderPermission(string userName, string fullPath, string password, string domain)
      {
          WindowsIdentity _principal = getWindowsIdentity(userName, domain, password);
          if (_principal == null)
          {
              throw new Exception("Invalid domain\\username or password");
              return;
          }

          var dInfo = new DirectoryInfo(fullPath);

          DirectorySecurity dSecurity = dInfo.GetAccessControl();

          AuthorizationRuleCollection acl = dSecurity.GetAccessRules
              (true, true, typeof (SecurityIdentifier));
          int count = acl.Count;
          int i = 0;
          while (i < count)
          {
              var rule =
                  (FileSystemAccessRule) acl[i];

              if (_principal.User.Equals(rule.IdentityReference))
              {
                  dSecurity.RemoveAccessRule(rule);
              }
              i++;
          }

          dInfo.SetAccessControl(dSecurity);
      }

      [DllImport("advapi32.dll", CallingConvention = CallingConvention.StdCall)]
      public static extern bool LogonUser(string lpszUsername,
                                          string lpszDomain, string lpszPassword, int dwLogonType,
                                          int dwLogonProvider, ref IntPtr phToken);

      private static WindowsIdentity getWindowsIdentity(string userName, string Domain, string Password)
      {
          bool posix = ((int) Environment.OSVersion.Platform == 128);
          WindowsIdentity user = null;
          try
          {
              if (posix)
              {
                  user = new WindowsIdentity(userName);
              }
              else
              {
                  IntPtr token = IntPtr.Zero;
                  LogonUser(userName, Domain, Password, 2, 0, ref token);
                  if (token == IntPtr.Zero)
                  {
                      return null;
                  }
                  user = new WindowsIdentity(token);
              }
          }
          catch (Exception ex)
          {
              return null;
          }

          return user;
      }

Helfdane wrote:

Anyone can help me find an answer why the threadpool continues to queue but not process the queued jobs until the queuing is complete? Thanks in advance.

Helfdane wrote:

the MSDN documentation where they mention that 25 threads per core is the max ideal number where the overhead would still be smaller than the improvement per thread.

Helfdane wrote:

why the threads are not working (are they on hold/in wait?)

Helfdane wrote:

performs acceptable given 40 threads

Dave Kreskowiak wrote:

it might sink in