C# WinApp ช่วยทำ string("25600703 022423") to datetime หน่อยครับ

 private void button1_Click(object sender, EventArgs e)
        {
            DateTime d;

            d = StrToDate("25600703 022423", "yyyyMMdd HHmmss");
            MessageBox.Show(d.ToString());
        }

        public DateTime StrToDate(string _DateTime, string _Format)
        {
            DateTime date1;
            try
            {
                System.DateTime.TryParseExact(_DateTime, _Format, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out date1);
                return date1;
            }
            catch (Exception ex)
            {
                throw (new ApplicationException(System.Reflection.MethodBase.GetCurrentMethod().Name + " : " + ex.Message));
            }
        }

string f = @"X:\REPORT\Aluminium\Aluminium_25600703 022423.Report";
            MessageBox.Show(StrToDate(Regex.Match(f, @"(.*?_)(.*?)(\s{1,}.*?\.Report)").Groups[2].Value, "yyyyMMdd HHmmss").ToString());

 public DateTime StrToDate(string _DateTime, string _Format)
        {
            DateTime date1;
            try
            {
                System.DateTime.TryParseExact(_DateTime, _Format, new System.Globalization.CultureInfo("th-TH"), System.Globalization.DateTimeStyles.None, out date1);
                return date1;
            }
            catch (Exception ex)
            {
                throw (new ApplicationException(System.Reflection.MethodBase.GetCurrentMethod().Name + " : " + ex.Message));
            }
        }

MessageBox.Show(Regex.Match(f, @"(.*?_)(.*?)(\s{1,}.*?\.Report)").Groups[2].Value + Environment.NewLine  + StrToDate(Regex.Match(f, @"(.*?_)(.*?)(\s{1,}.*?\.Report)").Groups[2].Value, "yyyyMMdd HHmmss").ToString()
                + Environment.NewLine + StrToDate("25600703", "yyyyMMdd HHmmss").ToString());

MessageBox.Show(StrToDate("25600703 022423", "yyyyMMdd HHmmss").ToString());

StrToDate("25600703", "yyyyMMdd HHmmss").ToString()

public static DateTime ToDate(this string strDate, string Date_Format, string Era_Type = "en-US")
       {
           DateTime dRet;
           return (DateTime.TryParseExact(strDate, Date_Format,
                                       new System.Globalization.CultureInfo("en-US"),
                                       System.Globalization.DateTimeStyles.None,
                                       out dRet)) ? dRet : DateTime.Parse(strDate);

       }