Delete read only condition files in c# or asp.net c# or windows services

public void Delete_file_ReadonlyCondition(string FilePath)

        {

         //// Set file permission to delete file

            FileAttributes attributes = File.GetAttributes(FilePath);

            if ((attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)

            {

                attributes &= ~FileAttributes.ReadOnly;

                File.SetAttributes(FilePath, attributes);

                File.Delete(FilePath);

            }

            else

            {

                FileInfo f = new FileInfo(FilePath);

                if (f.Exists)

                {

                    File.SetAttributes(FilePath, FileAttributes.Normal);

                    File.Delete(FilePath);

                }

            }

        }