在SelectedIndexChanged中下拉事件，您可以在网格上调用DataBind，这将导致它进行数据绑定.设置网格，以使参数之一是控制参数，并将其指向您的下拉菜单.

In the SelectedIndexChanged event for your drop down you can call DataBind on your grid which will cause it to databind. Setup your grid so that one of the parameters is a control parameter and point it to your dropdown.