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, can you guys please help me in this aspect
FYI, 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);
&nb ...