下拉列表事件不触发？原因
任何人都可以知道吗？
下拉列表事件不触发？为什么
编码:
protected void ddlplace_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddlplace.SelectedIndex > 0)
{
float delivervalue, tax, shipping;
string deliveryarea = ddlplace.SelectedItem.Value.ToString();
delivervalue = dal.getdelivervalue(deliveryarea);
lbldp.Text = delivervalue.ToString();
tax = dal.gettax(deliveryarea);
lbltax.Text = tax.ToString();
shipping = dal.getshipping(deliveryarea);
lblship.Text = shipping.ToString();
}
}