DropDownCheckList下拉多选控件ASP

ASP.NET上直接可用的DropDownCheckList下拉多选控件，已编译直接添加后可以在工具中拖选使用，非常方便快捷。 Creates a multi selection check box group which is displayed and hidden on the client through the use of a custom drop-down box; choices can be dynamically created by binding the control to a data source