Response to: I got this error string was not recognized as a valid datetime when I validate WPF DatePicker control

<mytoolkit:datepicker grid.row="4" grid.column="4" x:name="clndrHiredate" horizontalalignment="Left" height="20" xmlns:x="#unknown" xmlns:mytoolkit="#unknown">
                  Width="150" VerticalAlignment="Top" FontFamily="Tahoma" FontWeight="Light" FlowDirection="RightToLeft"/>

private void Window_Loaded(object sender, RoutedEventArgs e)
   {
   this.clndrHiredate.SelectedDate = Convert.ToDateTime(DateTime.Now.ToString("MM/dd/yyyy"));
   }

private void btnRead_Click(object sender, RoutedEventArgs e)
{
  if (clndrHiredate.SelectedDate == null)
     errorText += MessageBox.show("Wrong");
          state = true;
          lblHireDate.Visibility = Visibility.Visible;
      }
      else
      {
          // complete 
      }

}</mytoolkit:datepicker>