Response.Redirect to new window

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I just found the answer and it works 🙂

You need to add the following to your server side link/button:

OnClientClick="aspnetForm.target="_blank";"

My entire button code looks something like:

<asp:LinkButton ID="myButton" runat="server" Text="Click Me!" 
                OnClick="myButton_Click" 
                OnClientClick="aspnetForm.target="_blank";"/>

In the server side OnClick I do a Response.Redirect("MyPage.aspx"); and the page is opened in a new window.

The other part you need to add is to fix the form’s target otherwise every link will open in a new window. To do so add the following in the header of your POPUP window.

<script type="text/javascript">
    function fixform() {
        if (opener.document.getElementById("aspnetForm").target != "_blank") return;
        opener.document.getElementById("aspnetForm").target = "";
        opener.document.getElementById("aspnetForm").action = opener.location.href;
    }
</script>

and

<body onload="fixform()">

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