ArrayList mylist = new ArrayList();
mylist.Add (new DictionaryEntry ("1","坏"));
mylist.Add (new DictionaryEntry ("2","不好"));
mylist.Add (new DictionaryEntry ("3","一般"));
mylist.Add (new DictionaryEntry ("4","好"));
mylist.Add (new DictionaryEntry ("5","太好了"));
comboBox1.DataSource =mylist;
comboBox1.DisplayMember ="Value";
comboBox1.ValueMember ="Key";
mylist.Add (new DictionaryEntry ("1","坏"));
mylist.Add (new DictionaryEntry ("2","不好"));
mylist.Add (new DictionaryEntry ("3","一般"));
mylist.Add (new DictionaryEntry ("4","好"));
mylist.Add (new DictionaryEntry ("5","太好了"));
comboBox1.DataSource =mylist;
comboBox1.DisplayMember ="Value";
comboBox1.ValueMember ="Key";