This might be helpful to u...Do some changes according to ur grid
<asp:textbox> id=TextBox1 runat=server xmlns:asp=#unknown </asp:textbox>
<asp:calendarextender> id=CalendarExtender1 runat=server xmlns:asp=#unknown
Enabled=True TargetControlID=TextBox1 Format=dd/MM/yyyy </asp:calendarextender>
In code behind cs Write the below code u ll get present date
protected void Page_Load(object sender, EventArgs e)
{
CalendarExtender1.StartDate = DateTime.Now;
}