Then in the PostBack Event you can get the value of the HiddenField Control But not the TextBox Control, because the TextBox Control value will be reseted.
Here is an Example:
window.opener.document.getElementById('<%=Request["lat_ctr_id"]%>').value = marker.getPoint().lat();
window.opener.document.getElementById('<%=Request["ctr_hdn_lat_id"]%>').value = marker.getPoint().lat();
Now from my cs file, i have a search button with click event (this will do postback)
protected void btn_search_Click(object sender, EventArgs e)
Response.Redirect("search_results.aspx?lat=" + hdn_lat.Value);
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