System.IO.IOException: 'The parameter is incorrect'

Question

Hi,

I'm using net 8 C#.

I copy file in two steps:

From source to temp folder in C drive.

From temp folder to detination(USB) using impersonation.

When I copy small file is ok but when I copy big file 5G

I got exception:System.IO.IOException: 'The parameter is incorrect.

This the second step what wrong with it.

                        // Second step: temp to destination

                        if (SelectedDestinationDriveItem.DriveInfoValue.DriveType == DriveType.Removable)

                        {

                         // impersonation

#if WINDOWS

                       WindowsIdentity.RunImpersonated(

                        ImpersonationHelper.Token,

                               () =>

                               {

                                    var x2 = WindowsIdentity.GetCurrent().Name;

                                   // Copy files from temp folder to destination

                                   filesList = concatFiles.Split('?', StringSplitOptions.RemoveEmptyEntries);

                                   foreach (var file in filesList)

                                   {

                                       var destinationPathWithFileExtension = Path.Combine(SelectedDestinationItem.Path == null ?

                       SelectedDestinationItem.Name.TrimEnd('\\').TrimEnd('\\') : SelectedDestinationItem.Path, file.Replace(tempFolderFullPath, string.Empty).TrimStart('\\').TrimStart('\\'));

                                       var dirPathWithoutFileExtension = Path.GetDirectoryName(destinationPathWithFileExtension);

                                       if (!Directory.Exists(dirPathWithoutFileExtension))

                                       {

                                           Directory.CreateDirectory(dirPathWithoutFileExtension);

                                       }

                                       if (!File.Exists(destinationPathWithFileExtension))

                                       {

                                            File.Copy(file, destinationPathWithFileExtension, true);

                                       }

                                       else

                                       {

                                           int count = 1;

                                           while (File.Exists(destinationPathWithFileExtension))

                                           {

                                               string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(destinationPathWithFileExtension);

                                               string fileExtension = Path.GetExtension(destinationPathWithFileExtension);

                                               destinationPathWithFileExtension = Path.Combine(dirPathWithoutFileExtension, $"{fileNameWithoutExtension}({count}){fileExtension}");

                                               count++;

                                           }

                                            File.Copy(file, destinationPathWithFileExtension, true);

                                       }

                                   }

                                   

                               });

#endif