check sunday from 2 between dates

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LINQ

MVC

jQuery

C#3.5

I have 2 Column in database with 30 dates
my 1st date start with 01/04/2013 and 2nd ends with 30/04/2014
and on web page it will show in a string format
i'm using linq to for showing date on my web page.

Now how can check whether the particular date is Sunday.

below is my linq query

lstAbsentReconciled = (from db_Date in Date.AsEnumerable()
                      join db_Student in Student
                      on db_Date.roll_no equals db_Student.roll_no
                      where db_Date.roll_no == lngRollNo
                      && (db_Date.student_dt >= EndDt && db_Date.student_dt <= StartDt)
                      select new Student {
                         Student_id = db_Date .Student_id,
                         student_dt = ConvertToUserDate(db_Date.student_dt),
                         roll_no = db_Date.roll_no,
                      }).Distinct().ToList();

This Code is giving me my result...but how'll come to know that particular date from between 2 dates is sunday...!!