Open New Pop-Up Window from Server Side (Code Behind) in ASP.Net using C#

In this article, I will explain how to open new popup window from Server Side (Code Behind) in ASP.Net using C#.In order to open a new popup window from Server Side (Code Behind), we need to use the ClientScript RegisterStartupScript method to register the JavaScript method to open new window.

Source Code:-

<asp:Button ID="btn" runat="server" Text="Open new pop up window"

        onclick="btn_Click"  />

Code behind(c#)

string page = "newpopup.aspx";

        string open = "window.open('" + page + "', 'popup_window', 'width=300,height=100,left=100,top=100,resizable=yes,toolbar=no,scrollbars=no,');";

        ClientScript.RegisterStartupScript(this.GetType(), "script", open, true);

   

Out-Put:-