Not getting the data using wcf service

[OperationContract]
List<Cus> GetSelectedCus(int Party_Dim_Key);
public List<Cus> GetSelectedCus(int Party_Dim_Key)
        {
            List<Cus> Cuss = new List<Cus>();
            using (SqlConnection con = new SqlConnection(@"<>"))
            {

                using (SqlCommand cmd = new SqlCommand("Select * from CONSUMER2 where Party_Dim_Key=@Party_Dim_Key", con))
                {
                    con.Open();
                    cmd.Parameters.AddWithValue("@Party_Dim_Key", Party_Dim_Key);
                    SqlDataReader dr = cmd.ExecuteReader();
                    while (dr.Read())
                    {
                        Cus cus1 = new Cus();
                        cus1.Party_Dim_Key = int.Parse(dr["Party_Dim_Key"].ToString());
                        cus1.Customer_First_Nm = Convert.ToString(dr["Customer_First_Nm"]);
                        cus1.Customer_Gender_Nm = dr["Customer_Gender_Nm"].ToString();

                        cus1.PhoneNumber = Convert.ToString(dr["PhoneNumber"]);
                        cus1.Address = Convert.ToString(dr["Address"]);
                        cus1.City = Convert.ToString(dr["City"]);
                        cus1.Country = Convert.ToString(dr["Country"]);
                        cus1.Zipcode = Convert.ToString(dr["Zipcode"]);
                        cus1.EmailId = Convert.ToString(dr["EmailId"]);
                        cus1.Tagid = Convert.ToString(dr["Tagid"]);
                        cus1.SNo = Convert.ToString(dr["SNo"]);

                        cus1.batchid = int.Parse(dr["batchid"].ToString());
                        cus1.ClientId = int.Parse(dr["ClientId"].ToString());
                        cus1.pwd = Convert.ToString(dr["pwd"]);
                        cus1.CouponValue = int.Parse(dr["CouponValue"].ToString());
                        Cuss.Add(cus1);
                    }
                    con.Close();
                    return Cuss;
                }
            }