C# - Check File is being used by another process, if not delete files

Some times while try to deleting a file we may got a error message like
"It is being used by another person or program."

This means we can't delete a file, if it is being used.

I provide a solution to handle this kind of exception.

        /// <summary>

        /// This function is used to check specified file being used or not

        /// </summary>

        /// <param name="file">FileInfo of required file</param>

        /// <returns>If that specified file is being processed 

        /// or not found is return true</returns>

        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;

        }

     /// This function is used to delete all files inside a folder 

     public static void CleanFiles()

     {

            if (Directory.Exists("FOLDER_PATH"))

            {

                var directory = new DirectoryInfo("FOLDER_PATH");

               foreach (FileInfo file in directory.GetFiles())

               { 

                  if(!IsFileLocked(file)) file.Delete(); 

               }

            }

     }

Source: Internet