About insertion method?

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C#

public List<datalist7> getdata(string id)
       {
           SqlConnection con = new SqlConnection(@"Data Source=saba-PC;Initial Catalog=bcounts;Integrated Security=True");
           con.Open();
           SqlCommand cmd = new SqlCommand("Select Compcode,Acct_sub0,Acct_Desc from GI_sub0 where Compcode='" + id + "'", con);
           SqlDataReader rdr = cmd.ExecuteReader();
           List<datalist7> data = new List<datalist7>();
           if (rdr.HasRows)
           {
               while (rdr.Read())
                 data.Add(new datalist7(rdr.GetString(0), rdr.GetString(1), rdr.GetString(2),"","","",""));
           }
           con.Close();
           return data;
       }

[DataContract]

   public class datalist7
   {
       [DataMember]
       public string val1 { get; set; }
       [DataMember]
       public string val2 { get; set; }
       [DataMember]
       public string val3 { get; set; }
       [DataMember]
       public string val4 { get; set; }
       [DataMember]
       public string val5 { get; set; }
       [DataMember]
       public string val6 { get; set; }
       [DataMember]
       public string val7 { get; set; }
       public datalist7(string v1, string v2, string v3, string v4, string v5, string v6,string v7)
       {
           val1 = v1;
           val2 = v2;
           val3 = v3;
           val4 = v4;
           val5 = v5;
           val6 = v6;
           val7 = v7;
       }

   }

but when i am runnig this method on browser it shows :

{"getdataResult":[]}
what was the matter>> is it woking fine??
and my wcf client test application does not show this method ar any other method of my service?