ASP .NET code issue, small help

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ASP.NET

protected void Page_Load(object sender, EventArgs e)
    {
        int result = 0;
         Response.Write("<script>var a=confirm('You are about to change the shipping status of Order Id:! Are you sure you want to continue?');if(a==true){ "+result++ +"}; </script>");
         Response.Write("" + result);
    }

Hi All,
I am sharing a small piece of code here. My objective is that the 'result' variable value should increase only if 'a' is true. But it is not working irrespective of whether i am clicking on 'OK' or 'Cancel' button of the confirm box. It is always increasing the result variable. Please let me know the reason and any workaround.