How To Delete All Files And Folder

Using System.IO;

public static void CleanFiles(String FolderPath)
     {
            if (Directory.Exists(FolderPath))
            {
                var directory = new DirectoryInfo(FolderPath);
               foreach (FileInfo file in directory.GetFiles())
               { 
                  if(!IsFileLocked(file)) 
                       file.Delete(); 
               }
               foreach (DirectoryInfo subfolder in directory.GetDirectories())
                {
                    CleanFiles(subfolder);
                }
            }
     }

public static Boolean IsFileLocked(FileInfo file)

        {

            FileStream stream = null;

            try

            {

                //Don't change FileAccess to ReadWrite, 

                //because if a file is in readOnly, it fails.

                stream = file.Open

                (

                    FileMode.Open, 

                    FileAccess.Read, 

                    FileShare.None

                );

            }

            catch (IOException)

            {

                //the file is unavailable because it is:

                //still being written to

                //or being processed by another thread

                //or does not exist (has already been processed)

                return true;

            }

            finally

            {

                if (stream != null)

                    stream.Close();

            }

            //file is not locked

            return false;

        }