C\#유일한 주문 번 호 를 어떻게 생 성 합 니까?

/// <summary>
  ///      
  /// </summary>
  public class UniqueData
  {
    private static object obj = new object();
    private static int GuidInt { get { return Guid.NewGuid().GetHashCode(); } }
    private static string GuidIntStr { get { return Math.Abs(GuidInt).ToString(); } }

    /// <summary>
    ///   
    /// </summary>
    /// <param name="mark">  </param>
    /// <param name="timeType">       1  ,2  ,3  ，4  (  ) </param>
    /// <param name="id">id      0     id</param>
    /// <returns></returns>
    public static string Gener(string mark, int timeType = 4, int id = 0)
    {
      lock (obj)
      {
        var number = mark;
        var ticks = (DateTime.Now.Ticks - GuidInt).ToString();
        int fillCount = 0;//    

        number += GetTimeStr(timeType, out fillCount);
        if (id > 0)
        {
          number += ticks.Substring(ticks.Length - (fillCount + 3)) + id.ToString().PadLeft(10, '0');
        }
        else
        {
          number += ticks.Substring(ticks.Length - (fillCount + 3)) + GuidIntStr.PadLeft(10, '0');
        }
        return number;
      }
    }

    /// <summary>
    ///   
    /// </summary>
    /// <param name="mark">  </param>
    /// <param name="timeType">       1  ,2  ,3  ，4  (  )</param>
    /// <param name="id">id      0     id</param>
    /// <returns></returns>
    public static string GenerLong(string mark, int timeType = 4, long id = 0)
    {
      lock (obj)
      {
        var number = mark;
        var ticks = (DateTime.Now.Ticks - GuidInt).ToString();
        int fillCount = 0;//    

        number += GetTimeStr(timeType, out fillCount);
        if (id > 0)
        {
          number += ticks.Substring(ticks.Length - fillCount) + id.ToString().PadLeft(19, '0');
        }
        else
        {
          number += GuidIntStr.PadLeft(10, '0') + ticks.Substring(ticks.Length - (9 + fillCount));
        }
        return number;
      }
    }

    /// <summary>
    ///        
    /// </summary>
    /// <param name="timeType">       1  ,2  ,3  ，4  (  )</param>
    /// <param name="fillCount">    </param>
    /// <returns></returns>
    private static string GetTimeStr(int timeType, out int fillCount)
    {
      var time = DateTime.Now;
      if (timeType == 1)
      {
        fillCount = 6;
        return time.ToString("yyyyMMdd");
      }
      else if (timeType == 2)
      {
        fillCount = 4;
        return time.ToString("yyyyMMddHH");
      }
      else if (timeType == 3)
      {
        fillCount = 2;
        return time.ToString("yyyyMMddHHmm");
      }
      else
      {
        fillCount = 0;
        return time.ToString("yyyyMMddHHmmss");
      }
    }
  }