Linq To Sql Problem.

/*Class Contain Field return from Linq Query*/
public class CusInfomration
    {
        public string CustomerName
        {
            get;
            set;
        }
        public string CustomerID
        {
            get;
            set;
        }
        public string OrderDate
        {
            get;
            set;
        }
        public string OrderId
        {
            get;
            set;
        }
    }

   var CustomerFromWash =  from p in _NorthWindDataContext.Customers
                           join q in _NorthWindDataContext.Orders 
                           on  p.CustomerID   equals q.CustomerID
                           where p.Region == "WA"
                           select new
                           {                                                   
                             CustomerName =Convert.ToString(p.CompanyName),
                             CustomerID = Convert.ToString(p.CustomerID),
                             OrderId = Convert.ToString(q.OrderID),
                             OrderDate = Convert.ToString(q.OrderDate),
                           };
List<cusinfomration> lstCust = (List<cusinfomration>)CustomerFromWash;