Question

asp.net里面dropdownlist的数据绑定功能（使用泛型集合）

asp.net里面如何选择一个dropdownlist1的值而让另一个dropdownlist2里的值随之改变，就像一些网站上选择省份，而城市也随之改变的功能。

Answer 1

protected void DropDownList6_SelectedIndexChanged(object sender, EventArgs e)
{
binding2();
}

private void binding1()
{
DataSet ds3 = dbconn.getBinding("select addressid, addressname from AddressMessage where BelongCustomer='0000'", "a");
DropDownList6.DataSource = ds3;
DropDownList6.DataTextField = "addressname";
DropDownList6.DataValueField = "addressname";
DropDownList6.DataBind();
}

private void binding2()
{
DataSet ds1 = dbconn.getBinding("select addressid,addressname from AddressMessage where addressname='" + DropDownList6.SelectedValue + "' ", "aa");
DropDownList7.DataSource = ds1;
DropDownList7.DataTextField = "addressname";
DropDownList7.DataValueField = "addressname";
DropDownList7.DataBind();

}

Answer 2

到网上查一下省市联动就可以啦