c# - Getting selected item from a listbox -

my issue pretty weird, trying write string selected item of list, , string empty.

this code:

void loader(methodinfo[] metharr) {     //string abba = "";      listbox1.items.clear();      //loop     (int = 0; < metharr.length; i++)     {          ab = ab.appendline(metharr[i].tostring());          //abba = ab.tostring();          listbox1.items.add(ab);          ab.clear();     }   }  private void button1_click(object sender, eventargs e) {     checker(); }  private void button2_click(object sender, eventargs e) {      string = listbox1.getitemtext(listbox1.selecteditem.tostring());     string b = listbox1.selecteditem.tostring();     string c = "dummy";     messagebox.show(a + b + c); } 

if use selectedindex show me index, otherwise i'll c string

this full code : http://pastebin.com/i0mcetzz

debug - edit2

don't add string builder list, that's object reference object collection. use tostring() method (as have commented out)

see example:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace windowsformsapplication3 {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }          private void button1_click(object sender, eventargs e)         {             stringbuilder builder = new stringbuilder();              (int = 0; < 10; i++)             {                 builder.append(i);                 listbox1.items.add(builder);                 builder.clear();             }              (int = 0; < 10; i++)             {                 builder.append(i);                 listbox2.items.add(builder.tostring());                 builder.clear();             }         }          private void button2_click(object sender, eventargs e)         {             string = listbox1.getitemtext(listbox1.selecteditem.tostring());             string b = listbox1.selecteditem.tostring();             string c = listbox1.getitemtext(listbox1.selecteditem);             string d = listbox2.getitemtext(listbox2.selecteditem.tostring());             string f = listbox2.selecteditem.tostring();             string g = listbox2.getitemtext(listbox2.selecteditem);             messagebox.show("1:" + + b + c + "\r\n2: " + d+ f + g);         }     } }