public override string ToString() {
StringBuilder sb = new StringBuilder("AdImpressions(");
sb.Append("AdId: ");
sb.Append(AdId);
sb.Append(",ImpressionCount: ");
sb.Append(ImpressionCount);
sb.Append(",ImpressionTime: ");
sb.Append(ImpressionTime);
sb.Append(")");
return sb.ToString();
}