Im trying to make a dropdownlist control another via C#. My plan is, that the first DropDownList shows categories such as "Size" "Gender" "Model" and when you pick one of those, a new DropDownList shall appear with new sub categories for the former chosen category.Im trying to make a dropdownlist control anothe
阅读背景：
从一个下拉列表中选择类别，在另一个下拉列表中显示子类别。
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