I have a calendar control and a text box on a Web form, but the ist character is being dropped from the date (if the day has 2 digits)

protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
txtDate1.Text = Calendar1.SelectedDate.Date.ToString().Substring(1,10);
}
If date is 9/07/2006 ok , but for 28/07/2006 it moves 8/07/2006
I've tried increasing the Sibstring to (1,11) but it starts movng the time bit.

Any help appreciated

Regards,
Gerard