private static IEnumerable<ParticipationRecord> CreateRandomParticipationRecords(int min, int max)
{
var rnd = new Random();
for (var i = 0; i < rnd.Next(min, max); i++)
{
var uid = i.ToString();
var option = (rnd.Next(2) == 0).ToString();
var converted = rnd.Next(2) == 0;
yield return new ParticipationRecord(uid, option, converted, converted ? DateTime.Now : (DateTime?)null);
}
}