Drop Down List in AJAX Update Panel

Recently I come across a situation of how to open a new tab upon selecting a particular item from a drop down list which was inside an update panel.

So in this article I am going to show how I achieved that.

This is what I have in my design part:

<asp:UpdatePanel ID="up" runat="server" UpdateMode="Conditional">
                <asp:AsyncPostBackTrigger ControlID="ddlAuthoritytype" EventName="SelectedIndexChanged" />|
                <asp:DropDownList ID="ddlAuthoritytype" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlAuthoritytype_SelectedIndexChanged">
                    <asp:ListItem Text="One"></asp:ListItem>
                    <asp:ListItem Text="Two"></asp:ListItem>
                    <asp:ListItem Text="Three"></asp:ListItem>

A sample of the code I used for opening in a new tab is as follows:

var script = string.Format("window.open('{0}://{1}{2}{3}')", Request.Url.Scheme,
Request.Url.Host, port, ResolveUrl("~/Default2.aspx"));
                ScriptManager.RegisterStartupScript(this, this.GetType(), "newWindow", script,

Sample pages:

Default Page:

Drop down list in AJAX update panel

On selecting the required item it will open the corresponding page based on the drop down value you selected.

When One is selected the page will display as follows:

Drop down list in AJAX update panel

Like that for corresponding selection the respective pages are loaded.

Find out the attachment for further reference.