define month on Datetime code example
Example: c# compare months
if(DateTime.ParseExact(DDMonths.SelectedItem.Text, "MMMM", CultureInfo.CurrentCulture).Month > DateTime.Now.Month) {
...
}
if(DateTime.ParseExact(DDMonths.SelectedItem.Text, "MMMM", CultureInfo.CurrentCulture).Month > DateTime.Now.Month) {
...
}