/// <summary>
/// Generate string from class properties
/// </summary>
/// <returns>The string from class properties</returns>
public override string ToString()
{
return($"CurrencyCodes => {string.Join(',', CurrencyCodes.Select(c => $"{c.Key}: {c.Value}"))}" +
$"StartDate => {StartDate:yyyy-MM-dd}" +
$"EndDate => {(EndDate.HasValue ? EndDate.Value.ToString("yyyy-MM-dd") : "empty")}");
}
