In this article I will explain how to open new popup window from Server Side (Code Behind) in ASP.Net using C# and VB.Net.
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.
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HTML Markup
The HTML Markup consists of a Button control which will open a Popup Window from server side when clicked.
<asp:Button ID="btnNewWindow" Text="Open new Window" runat="server" OnClick="OpenWindow" />
Opening Popup Window from Server Side (Code Behind) using C# and VB.Net
On the click event handler of the Button, the window.open JavaScript function is passed is registered to execute on the Page Load using the ClientScript RegisterStartupScript function of ASP.Net.
C#
protected void OpenWindow(object sender, EventArgs e)
{
string url = "Popup.aspx";
string s = "window.open('" + url + "', 'popup_window', 'width=300,height=100,left=100,top=100,resizable=yes');";
ClientScript.RegisterStartupScript(this.GetType(), "script", s, true);
}
VB.Net
Protected Sub OpenWindow(sender As Object, e As EventArgs)
Dim url As String = "Popup.aspx"
Dim s As String = "window.open('" & url + "', 'popup_window', 'width=300,height=100,left=100,top=100,resizable=yes');"
ClientScript.RegisterStartupScript(Me.GetType(), "script", s, True)
End Sub
Note: It is very important to pass the 3rd parameter i.e. the options height, width, etc. when you want to open the page in New Window, if you skip that some newer browsers will open the page in New Tab instead of New Window.
![How to open New Window from Server Side (Code Behind) in ASP.Net using C# and VB.Net]()
Note: Newer browsers block Popup Windows that are opened automatically without clicking any link or button on the page and since here we open New Popup Window from server side some browsers might block it. Unfortunately there is no solution for it and your site’s users must trust and disable popup blockers.
Demo
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