请大虾指点．在线等．急

Question

public SqlDataReader GetProductCategories() 
        {            // Create Instance of Connection and Command Object
            SqlConnection myConnection = new SqlConnection("server=localhost;Trusted_Connection=true;database=Commerce");
            SqlCommand myCommand = new SqlCommand("CMRC_ProductCategoryList", myConnection);            // Mark the Command as a SPROC
            myCommand.CommandType = CommandType.StoredProcedure;
         myCommand.Parameters.Add("@CartID",SqlDbType.NVarchar,50);
myCommand.Parameters["@CartID"].Value=CartID;
            // Execute the command
            myConnection.Open();
            SqlDataReader result = myCommand.ExecuteReader(CommandBehavior.CloseConnection);            // Return the datareader result
            return result;
        }