The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.

List<string> results = new List<string>();
            try
            {
                string stringFileName = "";
                long lFileSize = 0;
                int nFileSize = 0;

                string[] stringFiles = Directory.GetFiles(strDirectoryName.ToString(), "*.*", bSubDirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);

                foreach (string stringFile in stringFiles)
                {
                    stringFileName = stringFile;
                    FileInfo objFileSize = new FileInfo(stringFileName);
                    lFileSize = objFileSize.Length;
                    nFileSize = (int)(lFileSize / 1000);
                    results.Add(stringFileName);
                }
            }
            catch (Exception x)
            {
                MessageBox.Show(x.Message);
            }