1，前台页面代码：
<asp:DropDownList ID="ddlink" runat="server" AutoPostBack="True" onselectedindexchanged="ddlink_SelectedIndexChanged">
</asp:DropDownList>
2，后台页面代码：
protected void ddlink_SelectedIndexChanged(object sender, EventArgs e)
{
string url = this.ddlink.SelectedValue;
if (url == "" || url.Equals(null))
{
return;
}
else
{
Page.ClientScript.RegisterStartupScript(GetType(), "", "<script>window.open('" + url + "');</script>");
}
｝
<asp:DropDownList ID="ddlink" runat="server" AutoPostBack="True" onselectedindexchanged="ddlink_SelectedIndexChanged">
</asp:DropDownList>
2，后台页面代码：
protected void ddlink_SelectedIndexChanged(object sender, EventArgs e)
{
string url = this.ddlink.SelectedValue;
if (url == "" || url.Equals(null))
{
return;
}
else
{
Page.ClientScript.RegisterStartupScript(GetType(), "", "<script>window.open('" + url + "');</script>");
}
｝
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