用DROPDOWNLIST里的SelectedIndexChanged事件就可以了,注意再将DROPDOWNLIST属性AutoPostBack设为"True",然后在 SelectedIndexChanged事件里写例如:TextBox1.Text = DropDownList1.SelectedItem.Text;
一个例子给你:
前台html代码:
后台代码:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = DropDownList1.SelectedItem.Text;
}