说明: 老师手把手教给俺们的啊,很珍贵的啊 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { if (this.DropDownList1.SelectedIndex == 0) { this.DropDownList2.Items.Clear(); this.DropDownList2.Items.Add("南阳市"); this.DropDownList2.Items.Add("信阳市")
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