populating a dropdown from database using javascript webservice

 [WebMethod(EnableSession = true)]

        public DataSet Findsome(string s)
        {
            string constr = "Initial Catalog=.........................";
            conn = new SqlConnection();
            conn.ConnectionString = constr;//Session["Constr"].ToString();
            conn.Open();

            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "Select distinct " + s + " from table  ";
            //cmd.Parameters.AddWithValue("@some", s);
            cmd.Connection = conn;
            SqlDataAdapter da = new SqlDataAdapter(cmd);

            DataSet ds = new DataSet();
            
            da.Fill(ds, "table");
            return ds;

        }

but this code is in a sepereate .asmx page