if(!Page.IsPostBack)
   {
    DataTable rblTable=new DataTable();
    rblTable.Columns.Add("CityName",System.Type.GetType("System.String"));
    rblTable.Columns.Add("CityNum",System.Type.GetType("System.Int32"));
    DataRow rblRow=rblTable.NewRow();
    rblRow["CityName"]="longkou";
    rblRow["CityNum"]=1;
    rblTable.Rows.Add(rblRow);
    this.RadioButtonList1.DataSource=rblTable;
    this.RadioButtonList1.DataTextField="CityName";
    this.RadioButtonList1.DataValueField="CityNum";
    this.RadioButtonList1.DataBind();
   }