1.在指定下标处添加:
DropDownList.Items.Insert(2, new ListItem("Title", "Value"));
2.在已存在的选择下添加:
DropDownList.Items.Add(new ListItem("Title", "Value")); DropDownList.Items.Add("Value");
3.在某个控件里面添加:
((DropDownList)wfvMaster.FindControl("DropDownList1")).Items.Add("Value");