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Linq statement returns null
EmployeeLog objEmpployeeLog =
             lstEmployeeLog.Where(x => x.EmpId == iEmpId
                    && x.InDateTime.Value == lastCheckInDate
                    && x.OutDateTime == null).FirstOrDefault();

var epsilon = TimeSpan.FromSeconds(1.0);
var logItem = employeeLog.Where(x => x.EmpId == empId
    && (x.InDateTime.Value - lastCheckInDate) < epsilon
    && x.OutDateTime == null).FirstOrDefault();