Question about c#

Question

Calender.StartDate = DateTime.Now; //dissabling past dates
  // Calendar1.StartDate = DateTime.Now.AddMonths(1);  // Start Calneder after one month from Present Date
  //Calendar1.EndDate = DateTime.Now;  // dissabling Future Dates
  /* Calendar1.StartDate = DateTime.Now;
  Calendar1.EndDate = DateTime.Now;*/ 

but when I write in my .net editor the start date property not shown
give me solustion.

Actually I want calender which show only current and future  date not shown past date how can I do  that ? I doing coding in visual studio 2008.

I am using web base application and I use calender extender in my web application