public bool Equals(Entry other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return Equals(other.FirstName, FirstName) && Equals(other.LastName, LastName) && Equals(other.Type, Type) && Equals(other.Number, Number) && other.PositionInFile == PositionInFile;
}