c# - How to Add multiple item in list Windows Phone -

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i working on windows phone app , want add item in exists list problem when have added first item ok when adding second item list replace previous added item

  private void btn_profession_loaded(object sender, routedeventargs e)     {         try         {             selectedkeywordsids = app.skillids;   // selected keyword             selectedprofname = app.professionalname;             selectedprofid = app.professionalid;             this.btn_profession.content = selectedprofname;               key = app.skillkeywords  ;              pro = app.professionalname;              final1=key.replace(pro, "");                list<string> numbers = final1.split(',').tolist<string>();              numbers.add(selectedkeywordsids);              numbers = numbers.where(s => !string.isnullorwhitespace(s)).distinct().tolist();               listbox1.itemssource = null;               listbox1.itemssource = numbers;      }

it looks building list previous variable final1 each time before adding item. should consider this

final1 = string.join(',', numbers.toarray());

after add new item. changes done "numbers" collection stored comma separated items in final1 variable.


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