Load data to CollectionViewSource

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C#

WPF

C#4.0

Hi All,

I've try to load data to CollectionViewSource using below code.But it will throw exception.How can I solve this problem?

_CollectionViewSource = (CollectionViewSource)this.FindResource("EmpAttendanceViewSource");
            if (dtp_Date.SelectedDate != null)
            {
                var obj = from ea in db.EmployeeAttendances
                          join emp in db.Employees
                          on ea.EmployeeId equals emp.EmployeeId
                          where ea.InDate == dtp_Date.SelectedDate
                          select new { emp.EmployeeFirstName, ea.InTime, ea.OutTime, ea.NoOfHours };
                _CollectionViewSource.Source = (CollectionViewSource)obj;

Exception Is,
{"A TwoWay or OneWayToSource binding cannot work on the read-only property 'InTime' of type '<>f__AnonymousType21`4[System.String,System.DateTime,System.Nullable`1[System.DateTime],System.Nullable`1[System.Double]]'."

Please help me.
Thanks,
Chamara