{"Index was out of range. Must be non-negative and less than

if (e2 != null)

{

if (dt != aaa[0].Date && e2[0].BranchId != aaa[0].BranchId && e2[0].StandardId != aaa[0].StandardId && e2[0].MediumId != aaa[0].MediumId)

{

List ddd = new List();

foreach (var y in e2)

{

ddd.Add(new AttendenceData()

{

Date = dt,

YearId = y.YearId,

StudentId = y.StudentId,

BranchId = y.BranchId,

StandardId = y.StandardId,

BoardId = y.BoardId,

MediumId = y.MediumId,

SubjectId = y.SubjectId,

Present = y.Present,

EnteryDate = System.DateTime.Now,

});

}