How to submit a page on the popup page?

In order to post the current page on the popup page, following code snippet can be written.

<input type="button" value="Post On Another Page" onclick="PostForm()" />

<script language="javascript" type="text/javascript">
    function PostForm(id)
    {
        var form = document.forms[0];
        form.action = "AnotherPage.aspx; // popup page url
        form.target = "_blank"; //open in another window
        form.submit();
        
        form.action = "currentpage.aspx"; // url of the current page
        form.target = ""; // remove the target you had specified
    }
</script>  

On the AnotherPage.aspx, write following code snippet in the Page Load to get the values of the control placed on the currentpage.aspx

foreach (string key in Request.Form.Keys)
        {
            if (key.Contains("yourtextboxid"))
            {
                string myTextBoxValue = Request.Form[key];
            }
        }

Hope this will be helpful.