detailsview 查找子控件,该如何解决

detailsview 查找子控件
我在detailview里加了个dropdownlist 我怎么在后台找到它呢?

[解决办法]

C# code

DropDownList dd= this.DetailsView1.FindControl("DropDownList1") as DropDownList;       string selectValue = dd.SelectedValue;