Calendar Control Date range

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ASP.NET4

Hi,
I am having a Calendar control.I want to select the dates between current date and next 60 or 90 days.If i am choosing previous date than the current date then it should not be selected.Can anyone suggest me some sample code.My code looks like this:

protected void Page_Load(object sender, EventArgs e)//for code behind
   {
       MyCalendar.VisibleDate = DateTime.Today;
   }
 protected void MyCalendar_PreRender(object sender, EventArgs e)
   {
       int minYear = 2013;
       int minMonth = 2;
       int minDay = 15;
       int maxYear = 2013;
       int maxMonth = 5;
       int maxDay = 30;

       if (MyCalendar.VisibleDate.Year > maxYear || (MyCalendar.VisibleDate.Year == maxYear && MyCalendar.VisibleDate.Month >= maxMonth && MyCalendar.VisibleDate.Day>=maxDay))
       {
           MyCalendar.NextMonthText = string.Empty;
       }
       else
       {
           MyCalendar.NextMonthText = ">";
       }
       if (MyCalendar.VisibleDate.Year < minYear || (MyCalendar.VisibleDate.Year == minYear && MyCalendar.VisibleDate.Month <= minMonth && MyCalendar.VisibleDate.Day>=minDay))
       {
           MyCalendar.PrevMonthText = string.Empty;
       }
       else
       {
           MyCalendar.PrevMonthText = "<";
       }

   }

<asp:Calendar ID="MyCalendar"  runat="server" SelectionMode="DayWeekMonth">