/// <summary>Gets the string representing the extension part of the file.</summary>
/// <returns>A string containing the <see cref="T:System.IO.FileSystemInfo" /> extension.</returns>
/// <filterpriority>1</filterpriority>
public string Extension
{
  get
  {
    char fullPath;
    int length = this.FullPath.Length;
    int num = length;
    do
    {
      int num1 = num - 1;
      num = num1;
      if (num1 < 0)
      {
        break;
      }
      fullPath = this.FullPath[num];
      if (fullPath != '.')
      {
        continue;
      }
      return this.FullPath.Substring(num, length - num);
    }
    while (fullPath != Path.DirectorySeparatorChar && fullPath != Path.AltDirectorySeparatorChar && fullPath != Path.VolumeSeparatorChar);
    return string.Empty;
  }
}