c# - How to work with down arrow key in Auto Suggest Box? -

in auto suggest box when pressing down arrow in suggestion list suggestion list getting closed automatically in no time.

i want keep open list until user presses enter key. xaml code

<autosuggestbox x:name="recipient" keyup="recipient_keydown" fontsize="18" height="50" textchanged="recipient_textchanged" suggestionchosen="recipient_suggestionchosen" x:uid="recipienttextplaceholder" horizontalalignment="left" background="white" verticalalignment="center" margin="30,20,0,0" style="{staticresource autosuggestboxstyle2}">                     <autosuggestbox.itemtemplate>                         <datatemplate>                             <grid>                                 <grid.columndefinitions>                                     <columndefinition width="auto"/>                                     <columndefinition/>                                     <columndefinition/>                                 </grid.columndefinitions>                                 <textblock text="{binding firstname}" grid.column="0" x:name="firstname" visibility="{binding firstname, converter={staticresource nullorwhitespaceconverter}}" textalignment="left"/>                                  <textblock text="|" grid.column="0" margin="0,0,-10,0" visibility="{binding visibility,elementname=middlename}" horizontalalignment="right"/>                                  <textblock text="{binding middlename}" margin="10,0,0,0" visibility="{binding middlename, converter={staticresource nullorwhitespaceconverter}}" x:name="middlename" grid.column="1" textalignment="left"/>                                  <textblock text="|" grid.column="1" visibility="{binding visibility,elementname=lastname}" margin="0,0,-6,0" horizontalalignment="right"/>                                  <textblock text="{binding lastname}" margin="10,0,0,0" x:name="lastname" visibility="{binding lastname, converter={staticresource nullorwhitespaceconverter}}" grid.column="2" textalignment="left"/>                                  <!--<textblock text="|" grid.column="2" margin="0,0,-6,0" visibility="{binding visibility,elementname=lastname}" horizontalalignment="right"/>-->                             </grid>                         </datatemplate>                     </autosuggestbox.itemtemplate>                 </autosuggestbox> 

textchanged event:

private void recipient_textchanged(autosuggestbox sender, autosuggestboxtextchangedeventargs args)     {         if (sender.text.length == 0)         {             recipient.itemssource = new list<string>();             return;         }         var recipientfilteredbypersondata = new list<table_people>();         var recipientfilteredbyplace = new list<table_places>();          if (peoplelist != null)         {             foreach (var item in peoplelist)             {                 if (item.firstname.contains(sender.text, stringcomparison.ordinalignorecase) || item.middlename.contains(sender.text, stringcomparison.ordinalignorecase) || item.lastname.contains(sender.text, stringcomparison.ordinalignorecase))                 {                     item.icon = "../assets/user_profile.png";                     recipientfilteredbypersondata.add(item);                 }             }             cvrbyperson.source = recipientfilteredbypersondata.orderby(x => x.firstname).groupby(x => x.firstname[0]).tolist();             //recipient.itemssource = recipientfilteredbypersondata;         }          if (placeslist != null)         {             foreach (var item in placeslist)             {                 if (item.accountnumber.contains(sender.text, stringcomparison.ordinalignorecase) || item.name.contains(sender.text, stringcomparison.ordinalignorecase))                 {                     item.icon = "../assets/ic_location.png";                     recipientfilteredbyplace.add(item);                 }             }             cvrbyplace.source = recipientfilteredbyplace.orderby(x => x.firstname).groupby(x => x.firstname[0]).tolist();             //recipient.itemssource = recipientfilteredbyplace;         }         list<object> combineplaceperson = (from x in recipientfilteredbypersondata select (object)x).tolist();         combineplaceperson.addrange((from x in recipientfilteredbyplace select (object)x).tolist());         if (combineplaceperson.count == 0)         {             var noresults = new list<table_people>();             var resultwithnoitem = new table_people { firstname = "no results." };             noresults.add(resultwithnoitem);             recipient.itemssource = noresults;         }         else         {             recipient.itemssource = combineplaceperson;         }     } 

suggestion chosen event:

 private void recipient_suggestionchosen(autosuggestbox sender, autosuggestboxsuggestionchoseneventargs args)     {         var gettype = args.selecteditem.gettype();         if (gettype.name == "table_people")         {             var selecteditemrecipient = args.selecteditem table_people;             sender.text = selecteditemrecipient.firstname + " " + selecteditemrecipient.lastname;             recipienterror.visibility = visibility.collapsed;             _personid = selecteditemrecipient.personid;         }         else         {             var selecteditemrecipientplaces = args.selecteditem table_places;             _placeid = selecteditemrecipientplaces.placeid;             sender.text = selecteditemrecipientplaces.firstname + " " + selecteditemrecipientplaces.lastname;             recipienterror.visibility = visibility.collapsed;         }      } 

i setting itemssource code.do need handle keup event or not?

private void recipient_keyup(object sender, keyroutedeventargs e)     {         if (e.key == windows.system.virtualkey.down)         {             recipient.issuggestionlistopen = true;         }     } 

thanks in advance.

that might you. used on windows forms combobox

private void combobox1_keydown(object sender, keyeventargs e) {     if (e.keycode == keys.down) messagebox.show("hello"); }