winforms - c#: adding new item to comboBox -

i want list of clients ip address added combobox in winforms list doesn't appear in combobox.

here code server

// list of sockets each client connected server list<socket> astr = new list<socket>();     public form1()     {         initializecomponent();         addfg();         combobox1.selectedindexchanged += combobox1_selectedindexchanged;     }  public void addfg()  {   foreach (socket s in astr)    {     string str = string.format("client : " + s.remoteendpoint);     combobox1.items.add(new object[] {str})   } } private void combobox1_selectedindexchanged(object sender, eventargs e) {    messagebox.show(combobox1.items[0]);  } 

but getting error "argumentexception unhandled" or in detail "items collection cannot modified when datasource property set".

try this:

foreach (socket s in astr)  {   string str = string.format("client : " + s.remoteendpoint);   combobox1.items.add(str); } 

in version, looks trying add array, items.add() method adds single item. add multiple items, use addrange(), doesn't case code.

be careful code:

private void combobox1_selectedindexchanged(object sender, eventargs e) {    messagebox.show(combobox1.items[0]); } 

you should check see if selected:

if (combobox1.items.selectedindex > -1) {    messagebox.show(combobox1.items[0]); }