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PaymentLista = PaymentLista.Where(o => (o.StartDate <= payment.StartDate && o.EndDate <= payment.EndDate)
||(o.StartDate >= payment.StartDate && o.EndDate >= payment.EndDate)
||(o.StartDate <= payment.StartDate && o.EndDate <= payment.EndDate)
||(o.StartDate <= payment.StartDate && o.EndDate >= payment.EndDate)).ToList();