1-) C# RMOS - Klasördeki tüm dosya isimlerini değiştirme

 public void replace()

        {

            DirectoryInfo d = new DirectoryInfo(@"kategoriler");

            FileInfo[] infos = d.GetFiles();

            foreach (FileInfo f in infos)

            {

                if (f.FullName.Contains("25") || f.FullName.Contains("26"))

                {

                    try

                    {

                        int index = f.FullName.ToString().LastIndexOf("_");

                        string name = f.FullName.ToString().Substring(0, index) + ".xlsx";

                        File.Move(f.FullName, name);

                        File.Delete(f.FullName);

                    }

                    catch (Exception ex)

                    {

                    }

                }

            }

        }