Webservice using Generic Collections

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Services;
using System.Data.SqlClient;

namespace Webservice
{   
    [WebService(Namespace = "http://Your_URL.in/",Description="Country capital and their codes",Name="Country Details")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    
    public class WebService1 : System.Web.Services.WebService
    {
        SqlConnection con = new SqlConnection("Connection String");
public class CountryDetails
        {
            public string country;
            public string capital;
            public int Code;
        }

[WebMethod]
        public List country(string Country)
        {
            string sqlQuery = "select * from country where Country_Name='"+Country+"' ";
            con.Open();
                SqlCommand com = new SqlCommand(sqlQuery, con);    
                  SqlDataReader read = com.ExecuteReader();
                  var stri = new List();
                  read.Read();
                 
                      while (read.HasRows)
                      {
                          var s = new CountryDetails();
                          s.Code = Convert.ToInt32(read["Country_Code"].ToString());
                          s.capital = read["Capital"].ToString();
                          s.country = read["Country_Name"].ToString();
                          stri.Add(s);
                          while (read.Read())
                          {
                              var s1 = new CountryDetails();
                              s1.Code = Convert.ToInt32(read["Country_Code"].ToString());
                              s1.capital = read["Capital"].ToString();
                              s1.country = read["Country_Name"].ToString();
                              stri.Add(s1);
                          }
                          read.NextResult();
                      }                  
                  return stri.ToList();
        }
}
}