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public static long _dateNo;
  public static long DateNo { 
  get { if (_dateNo == 0) _dateNO = long.Parse(DateTime.Now.ToString("yyyy-MM-dd") + "0000"); return _dateNo + 1; } 
  }

public void BtnClick()
{
  txtText.Text = DateNo.ToString();
}

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public static long _dateNo;
public static long DateNo {
get { if (_dateNo == 0) _dateNO = long.Parse(DateTime.Now.ToString("yyyy-MM-dd") + "0000"); return _dateNo + 1; }
}

public void Bt¡­¡­

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private int i=0;
private string OrderNo
{
  get
  {
  return string.Format("{0}{1:d2}{2:d2}{3:d4}",DateTime.Now.Year,DateTime.Now.Month,DateTime.Now.Day,i++);
  }
}
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  public static long _dateNo;
  public static long DateNo
  {
  get {
  if (_dateNo == 0)
  _dateNo = long.Parse(Dat