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Binding b = new Binding("Text", m_bindingSource, "AttID_4", true, DataSourceUpdateMode.OnPropertyChanged, string.Empty);

mtbx.Mask = "00/00/0000";

mtbx.ValidatingType = typeof(DateTime);

b.Parse += new ConvertEventHandler(b_Parse_DateTime);

EventHandler:
 private void b_Parse_DateTime(object sender, ConvertEventArgs e)
        {
            try
            {
                if (e.Value != null && e.Value.ToString().Length == 10)
                {
                    if (e.Value != DBNull.Value)
                    {
                        string shortDatePattern = SharedBusinessLogic.DateTimeConverter.GetShortDateInputPattern();
                        
                        e.Value = Convert.ToDateTime(e.Value).ToString(shortDatePattern);
                    }
                    else
                    {
                      
                        e.Value = DateTime.Now.ToString();
                    }
                }
                else
                {

                    e.Value = DateTime.Now.ToString();
                }
            }
            catch (Exception ex)
            {
                SendExceptionMail(ex);
            }            
        }