控件效果如下：
从左到右：month，day，year
.cs文件初始化这三个下拉列表 代码如下: private void BindBirthDay(int day, int month, int year) { int dayNow = day; int monNow = month; int yearNow = year; //binding Month for (int i = 1; i <= 12; i++) { ddlBirMon.Items.Add(new ListItem(i.ToString(), i.ToString())); } ddlBirMon.Items[monN
