[c#] How to open a page in a new window or tab from code-behind

So I have a webapplication where I select a value from a dropdownlist. When this value is selected, I want to load another page in a new window.

I tried this:

ScriptManager.RegisterStartupScript(Page, typeof(Page), "OpenWindow", "window.open('Default.aspx', '_blank');", true);

It does open the page, but not in a new window/tab. It opens it in the current opened page.

Alternatively I tried:

ClientScript.RegisterStartupScript(this.GetType(), "OpenWin", "<script>openDashboardPage()</script>");

and

HttpContext.Current.Response.Write("<SCRIPT LANGUAGE='JavaScript'>window.open('Default.aspx', '_new');</SCRIPT>");

They all behave in the same fashion. I just loads the page in the existing window. I tried it in both Firefox and Chrome, thinking it might be a browser thing, but they both behaved the same.

How do I open a new window?

You can use scriptmanager.registerstartupscript to call a JavaScript function.

Inside that function, you can open a new window.

Target= "_blank"

This does it in html, give it a try in C#

Use:

Target= "_blank" property of anchor tag

This code works for me:

Dim script As String = "<script type=""text/javascript"">window.open('" & URL.ToString & "');</script>"
ClientScript.RegisterStartupScript(Me.GetType, "openWindow", script)