C# WinApp เขียนโค๊ด replace folder เวลา copy/move folder ยังไงครับ

string fol = System.IO.Path.GetFileName(directoryName_loopVariable);
                cri.ForEach((string item) => { fol = fol.Replace(item, "").Trim(); });
                fol = System.IO.Path.GetDirectoryName(directoryName_loopVariable) + "\\" + fol;
                try
                {
                    System.IO.DirectoryInfo _dirInfo = new System.IO.DirectoryInfo(directoryName_loopVariable);
                    _dirInfo.MoveTo(fol);
                }
                catch 
                {

                    foreach (string file in System.IO.Directory.GetFiles(directoryName_loopVariable, "*.*"))
                    {
                            string _file =fol + "\\" + System.IO.Path.GetFileName(file);
                        if (System.IO.File.Exists(_file) && _file != file)
                        {
                            string stg;
                            int i = 1;
                            do
                            {
                                stg = System.IO.Path.GetDirectoryName(_file) + "\\" + System.IO.Path.GetFileNameWithoutExtension(_file) + "_" + i + System.IO.Path.GetExtension(_file);
                                i++;
                            } while (System.IO.File.Exists(stg));
                            _file = stg;
                        }
                        System.IO.File.Move(file, _file);
                        System.Threading.Thread.Sleep(10);
                    }

                    try { new System.IO.DirectoryInfo(directoryName_loopVariable).Delete(); }catch{}
                   
                }
                //"Cannot create a file when that file already exists."