public override string ToString()
{
return string.Format("[NumberLease: {0} LeaseBegin={1}, LeaseEnd={2}, AutoRenew={3}, Status={4}, CallFeatureStatus={5}, TextFeatureStatus={6}, Labels={7}]",
base.ToString(), LeaseBegin, LeaseEnd, AutoRenew, Status, CallFeatureStatus, TextFeatureStatus, Labels);
}