Input string not in correct format

Question

String dd = DateTime.Now.ToString("MM/dd/yyyy");

var BookingInfo = (from x in db.BookingInformations

where ((Convert.ToInt32(x.Date.ToString())) <= (Convert.ToInt32(dd.ToString())))

select x.Date)

 

I am comparing to date but every time I am getting error 'Input string not in correct format' 

What I am doing wrong?