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));
}