c# - Prevent page reload when setting session variable -

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i have asp button, , on click event session variable set , page redirected. problem process requires 2 clicks - once set session , redirect. how can set session , redirect in 1 click? code follows:

protected void btn_login_click(object sender, eventargs e) {        httpcontext.current.rewritepath("anotherpage.aspx");        session.add("user-id", _id); } 

protected void btn_login_click(object sender, eventargs e) {            session.add("user-id", _id);     response.redirect("anotherpage.aspx"); }

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