public string ToString(string separator, string dateTimeFormat = null) { var items = new[] { TimeOpen.ToStringUniform(dateTimeFormat), Open.ToStringUniformPriceFormat(true), High.ToStringUniformPriceFormat(true), Low.ToStringUniformPriceFormat(true), Close.ToStringUniformPriceFormat(true), Volume.ToString() }; return(string.Join(separator, items)); }