Combo box fill using LINQ

Hi,

I am stuck with the function that returns the results from a LINQ2SQL stored procedure. This function will be used as a combo box data source to fill it. Any suggestions.

 public List<TM_Payment> getSuspendedPayments()

        {

            List<TM_Payment> Identity = (List<TM_Payment>)tmd.TM_GetSuspendedPayments();

            return Identity;

        }

Unable to cast object of type 'SingleResult`1[TradeMark.TM_GetSuspendedPaymentsResult]' to type 'System.Collections.Generic.List`1[TradeMark.TM_Payment]'.

Thanks,
Raghu