public bool CurrencyExist(string currencyId, string organizationId)
{
var predicate = Builder.Query.And(
Builder.Query <Others.Currency> .EQ(i => i.Id, currencyId),
Builder.Query <Others.Currency> .EQ(i => i.OrganizationId, organizationId));
return(CurrencyCollection.Count(predicate) > 0);
}