asp.net - Combo box with multiple columns and related values -

is possible show multiple columns , headers inside of combo box/dropdown list in asp.net , show related columns values, example, if click on country name should show me cities country , clicking on city name should show me related places.

is there third part control available? have checked telerik , have combo box multiple columns not related values.

i hope started.

<telerik:radcombobox id="radcombobox1" runat="server" autopostback="true"      onselectedindexchanged="radcombobox1_selectedindexchanged">     <itemtemplate>         <table width="100%">             <tr>                 <td>                     <%# eval("name") %>                 </td>                 <td>                     <%# eval("population")%>                 </td>             </tr>         </table>     </itemtemplate> </telerik:radcombobox> <telerik:radcombobox id="radcombobox2" runat="server" autopostback="true"      onselectedindexchanged="radcombobox2_selectedindexchanged">     <itemtemplate>         <table width="100%">             <tr>                 <td>                     <%# eval("name") %>                 </td>                 <td>                     <%# eval("population")%>                 </td>             </tr>         </table>     </itemtemplate> </telerik:radcombobox> <telerik:radcombobox id="radcombobox3" runat="server">     <itemtemplate>         <table width="100%">             <tr>                 <td>                     <%# eval("name") %>                 </td>                 <td>                     <%# eval("population")%>                 </td>             </tr>         </table>     </itemtemplate> </telerik:radcombobox>  public class country {   public int id { get; set; }   public string name { get; set; }   public int population  { get; set; } }  public class state {   public int id { get; set; }   public int countryid { get; set; }   public string name { get; set; }   public int population { get; set; } }  public class city {   public int id { get; set; }   public int stateid { get; set; }   public string name { get; set; }   public int population { get; set; } }  public list<country> countries {     {     return new list<country>       {         new country {id = 1, name = "united states", population = 1000},         new country {id = 2, name = "canada", population = 2000},         new country {id = 3, name = "mexico", population = 3000}       };   } }   public list<state> states {     {     return new list<state>       {         new state {id = 1, countryid = 1, name = "california", population = 100},         new state {id = 2, countryid = 1, name = "new york", population = 200},         new state {id = 3, countryid = 2, name = "quebec", population = 300},         new state {id = 4, countryid = 2, name = "ontario", population = 400}       };   } }   public list<city> cities {     {     return new list<city>       {         new city {id = 1, stateid = 1, name = "los angeles", population = 10},         new city {id = 2, stateid = 1, name = "san diego", population = 20},         new city {id = 3, stateid = 1, name = "san francisco", population = 30},         new city {id = 4, stateid = 1, name = "san joe", population = 40},         new city {id = 5, stateid = 2, name = "new york", population = 50},         new city {id = 6, stateid = 2, name = "paterson", population = 60},         new city {id = 7, stateid = 2, name = "newark", population = 70},         new city {id = 8, stateid = 2, name = "smithtown", population = 80},       };   } }  protected void page_load(object sender, eventargs e) {   if(!ispostback)   {     radcombobox1.datasource = countries;     radcombobox1.datavaluefield = "id";     radcombobox1.datatextfield = "name";     radcombobox1.databind();      radcombobox1.items.insert(0, new radcomboboxitem("select country", ""));   } }  protected void radcombobox1_selectedindexchanged(   object sender, radcomboboxselectedindexchangedeventargs e) {   radcombobox2.items.clear();   radcombobox3.items.clear();    int countryid;   if (int32.tryparse(e.value, out countryid))   {     radcombobox2.datasource = states.where(s => s.countryid == countryid);     radcombobox2.datavaluefield = "id";     radcombobox2.datatextfield = "name";     radcombobox2.databind();      radcombobox2.items.insert(0, new radcomboboxitem("select state", ""));   } }  protected void radcombobox2_selectedindexchanged(   object sender, radcomboboxselectedindexchangedeventargs e) {   radcombobox3.items.clear();    int stateid;   if (int32.tryparse(e.value, out stateid))   {     radcombobox3.datasource = cities.where(c => c.stateid == stateid);     radcombobox3.datavaluefield = "id";     radcombobox3.datatextfield = "name";     radcombobox3.databind();      radcombobox3.items.insert(0, new radcomboboxitem("select city", ""));   } }