Web Forms :: Looping Through Calendar Cells?

I've a asp:Calendar control and to each date, dynamically when the calendar renders i'm adding a checkbox next to it.

The user can check and uncheck the checkbox , based on that i need to send the checked dates to my database.

Now, my problem is that i have no idea what to use to collect the dates list to send it to database.

i am giving the code which i have used in the Calendar Dayrender Event

protected void LunchCalendar_DayRender(object sender, DayRenderEventArgs e)
{
e.Cell.Text = "";
CheckBox c = new CheckBox();
e.Cell.Controls.Add(c);
c.Text = e.Day.DayNumberText;
if (e.Day.IsOtherMonth)
{
e.Cell.Text = null;
}
if (e.Day.IsWeekend)
{
c.Checked = true;
c.Enabled = false;
}
}