How do I create a directory or file with 777 permission and a specific username and group

How do I create a directory with 777 permission and a specific username and group

...

 using (SftpClient sftp = new SftpClient(ipSftpServer, portSftpServer, userSftp, passSftp))
                        {
                            sftp.Connect();
                            CreateServerDirectoryIfItDoesntExist(destSftpPath, sftp);
                            memoryStream.Seek(0, SeekOrigin.Begin);
                            sftp.UploadFile(memoryStream, destSftpPath, delegate (ulong d)
                            {
                                if (uploadCallback != null)
                                {
                                    uploadCallback((long)d, bytesTotal);
                                }
                            });
                            // chown -R dcm4chee-arc:dcm4chee-arc .
                            //change user and group dcm4chee-arc dcm4chee-arc
                            sftp.ChangePermissions(destSftpPath, 777);
                            Console.WriteLine($"end of file copy");
                            sftp.Disconnect();
                        }

...
 private static void CreateServerDirectoryIfItDoesntExist(string serverDestinationPath, SftpClient sftpClient)
    {

        string[] directories = serverDestinationPath.Split('/');    
        Array.Resize(ref directories, directories.Length - 1);      
        for (int i = 0; i < directories.Length; i++)
        {
            if (i > 0)
            {
                string dirName = string.Join("/", directories, 0, i + 1);
               
                if (!sftpClient.Exists(dirName))
                {                
                    sftpClient.CreateDirectory(dirName);
                    // chown -R dcm4chee-arc:dcm4chee-arc .
                    //example user and group: dcm4chee-arc dcm4chee-arc
                    //How do I create a directory with 777 permission and a specific username and group
                    sftpClient.ChangePermissions(dirName, 777);
                    
                }
            }
        }
    }

Start with the SftpClient.CreateDirectory, UploadFile, and ChangePermissions calls shown in the issue, and check the SSH.NET API documentation for ownership and permission support. Done means determining whether the requested directory and file ownership behavior is supported and providing an unambiguous usage or limitation answer.