c# - Application crashing when adding item to listbox -

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when try add listbox, application close.

this have far. line causing close is: listbox1.items.add(term1)

using system; using system.io; using system.collections; using system.collections.generic; using system.linq; using system.net; using system.windows; using system.windows.controls;  using system.windows.documents; using system.windows.input; using system.windows.media; using system.windows.media.animation; using system.windows.shapes; using microsoft.phone.controls;  namespace phoneapp1 {     public partial class mainpage : phoneapplicationpage {     // constructor     public class item {         public string itemline1 { get; set; }         public string itemline2 { get; set; }     }      public mainpage() {         initializecomponent();         list<item> list = new list<item>();         item item = new item();         item.itemline1 = "item11";         item.itemline2 = "item12";         list.add(item);         item = new item();         item.itemline1 = "item21";         item.itemline2 = "item22";         list.add(item);         item = new item();         item.itemline1 = "item31";         item.itemline2 = "item32";         list.add(item);          dispatcher.begininvoke(new action(() =>         listbox1.itemssource = list         ));          webclient wc = new webclient();         wc.downloadstringcompleted += new downloadstringcompletedeventhandler (wc_downloadstringcompleted);         wc.downloadstringasync(new uri("http://www.usi.edu/webservices/iphone/usiinfoterms.xml"));      }      void wc_downloadstringcompleted(object sender, downloadstringcompletedeventargs e) {         applicationtitle.text = e.result;                     string terms = applicationtitle.text;         applicationtitle.text = "course catalog";         string term1 = terms.substring(terms.indexof("value"+7),terms.indexof("/value"));         listbox1.items.add(term1);     }      private void listbox1_selectionchanged(object sender, selectionchangedeventargs e) {         if (sender != null) pagetitle.text = sender.tostring();         if (e != null) pagetitle.text = e.addeditems.count.tostring();          ienumerator ie = e.addeditems.getenumerator();         ie.movenext();          if (e != null) applicationtitle.text = ie.current.tostring();     }   } }

you've set itemssource accept type of item, you're adding string it. turn string item before adding it, matches expected type of itemsource.


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