IList怎么绑定到下拉框

Ilist 里面实现 List<T> list = new List<Role>();
然后下拉列框的数据源绑定到 list上！

List<Department> departList = result.Context as List<Department>;
ddlDepartment.DataSource = departList;
ddlDepartment.DataTextField = "DepartmentName";
ddlDepartment.DataValueField = "ID";
ddlDepartment.DataBind();