Return ArrayList from WCF Service

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C#

i am implementing WCF service in that i am converting dataset to arraylist and returning when i run the proxy this menthod not invokable and it showing "!" this mark

below is my code

namespace WCFService
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {       

        [OperationContract]
        Customer GetCustomer(int id);

        // TODO: Add your service operations here
    }


    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    

    [DataContract]
    public class Customer
    {
        [DataMember]
        public ArrayList GetCust
        {
            get;
            set;
        }
    }
}

namespace WCFService
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
    public class Service1 : IService1
    { 

        public Customer GetCustomer(int id)
        {
            SqlConnection con = new SqlConnection("Data Source=.;Database=Temp;Integrated Security=true");
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "Select * from tblCustomerInfo_Bangalore where CID = "+id;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            Customer cu = new Customer();
            
            ArrayList list = new ArrayList();

            foreach (DataRow row in ds.Tables[0].Rows)
            {

                list.Add(row);
            }
            cu.GetCust = list;
            return cu;

        }
        
    }
}

can any body help me out in this......



thank you.