C# QQ weather

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/// <summary>     /// 2011-06-16 塗聚文     /// </summary>     public partial class QQweather : System.Web.UI.Page     {           public string selectcity = "1";         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Page_Load(object sender, EventArgs e)         {             ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);             HttpWebRequest req = (HttpWebRequest)WebRequest.CreateDefault(new Uri("https://www.dusystem.com/QQweather.aspx"));             req.Method = "GET";             HttpWebResponse res = (HttpWebResponse)req.GetResponse();             selectcity = DropDownList1.SelectedValue.ToString();             if (!IsPostBack)             {                   this.DropDownList1.DataSource = CreateDataSource();                 DropDownList1.DataTextField = "WeatherTextField";                 DropDownList1.DataValueField = "WeatherValueField";                   // Bind the data to the control.                 DropDownList1.DataBind();                   // Set the default selected item, if desired.                 DropDownList1.SelectedIndex = 0;                 selectcity = @"1";             }             }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Button1_Click(object sender, EventArgs e)         {             ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);             HttpWebRequest req = (HttpWebRequest)WebRequest.CreateDefault(new Uri("https://www.dusystem.com/QQweather.aspx"));             req.Method = "GET";             HttpWebResponse res = (HttpWebResponse)req.GetResponse();             selectcity = DropDownList1.SelectedValue.ToString();         }         /// <summary>         /// <%# selectcity%>         /// </summary>         /// <returns></returns>         ICollection CreateDataSource()         {                          DataTable dt = new DataTable();                        dt.Columns.Add(new DataColumn("WeatherTextField", typeof(String)));             dt.Columns.Add(new DataColumn("WeatherValueField", typeof(String)));             dt.Rows.Add(CreateRow("香港", "1", dt));             dt.Rows.Add(CreateRow("澳門", "2", dt));             dt.Rows.Add(CreateRow("哈爾濱", "17", dt));             dt.Rows.Add(CreateRow("烏魯木齊", "28", dt));             dt.Rows.Add(CreateRow("西寧", "56", dt));             dt.Rows.Add(CreateRow("蘭州", "57", dt));             dt.Rows.Add(CreateRow("呼和浩特", "69", dt));             dt.Rows.Add(CreateRow("銀川", "78", dt));             dt.Rows.Add(CreateRow("石家莊", "82", dt));             dt.Rows.Add(CreateRow("太原", "84", dt));             dt.Rows.Add(CreateRow("長春 ", "103", dt));             dt.Rows.Add(CreateRow("瀋陽 ", "115", dt));             dt.Rows.Add(CreateRow("北京 ", "125", dt));             dt.Rows.Add(CreateRow("天津 ", "127", dt));             dt.Rows.Add(CreateRow("濟南 ", "140", dt));             dt.Rows.Add(CreateRow("拉薩 ", "150", dt));             dt.Rows.Add(CreateRow("成都 ", "166", dt));             dt.Rows.Add(CreateRow("昆明 ", "179", dt));             dt.Rows.Add(CreateRow("西安 ", "186", dt));             dt.Rows.Add(CreateRow("鄭州 ", "189", dt));             dt.Rows.Add(CreateRow("武漢 ", "211", dt));             dt.Rows.Add(CreateRow("重慶 ", "212", dt));             dt.Rows.Add(CreateRow("長沙 ", "218", dt));             dt.Rows.Add(CreateRow("貴陽 ", "227", dt));             dt.Rows.Add(CreateRow("桂林 ", "232", dt));             dt.Rows.Add(CreateRow("南京 ", "244", dt));             dt.Rows.Add(CreateRow("合肥 ", "248", dt));             dt.Rows.Add(CreateRow("上海 ", "252", dt));             dt.Rows.Add(CreateRow("杭州 ", "255", dt));             dt.Rows.Add(CreateRow("南昌 ", "264", dt));             dt.Rows.Add(CreateRow("福州 ", "276", dt));             dt.Rows.Add(CreateRow("臺北 ", "280", dt));             dt.Rows.Add(CreateRow("廈門 ", "287", dt));             dt.Rows.Add(CreateRow("廣州 ", "292", dt));             dt.Rows.Add(CreateRow("南寧 ", "295", dt));             dt.Rows.Add(CreateRow("深圳 ", "296", dt));             dt.Rows.Add(CreateRow("海口 ", "303", dt));             DataView dv = new DataView(dt);             return dv;           }         /// <summary>         ///         /// </summary>         /// <param name="Text"></param>         /// <param name="Value"></param>         /// <param name="dt"></param>         /// <returns></returns>         DataRow CreateRow(String Text, String Value, DataTable dt)         {             DataRow dr = dt.NewRow();             dr[0] = Text;             dr[1] = Value;             return dr;           }         public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)         {             //直接确认，否则打不开             return true;         }