public string formatDataStr(string objstring)

        {

            if (objstring == "" || objstring == null || objstring == ".")

            {

                return "";

            }

            else

            {

                string tmpresultstr;

                objstring = objstring.Replace(",", ".").Replace("，", ".").Replace(" ", "").Replace("/", ".").Replace("-", ".");

                string[] objstringlist = objstring.Split('.');

                if (objstringlist.Count() >= 1)

                {

                    if (objstringlist[0].Trim().Length == 2)

                    {

                        tmpresultstr = "20" + objstringlist[0].Trim();

                    }

                    else

                    {

                        tmpresultstr = objstringlist[0].Trim();

                    }

                    for (int i = 1; i < objstringlist.Count(); i++)

                    {

                        if (objstringlist[i].Trim().Length == 1)

                        {

                            objstringlist[i] = "0" + objstringlist[i].Trim();

                        }

                        tmpresultstr = tmpresultstr + "." + objstringlist[i];

                    }

                    return tmpresultstr;

                }

                else

                {

                    return objstring;

                }

            }

        }