In your webmethod change like this:
[WebMethod]
public static void Go_BDPolicy(string pol)
{
return "Any Msg";
}
In success part of your code change like:
success: function (Result) {
var msg = Result.d;
if (msg == "Any Msg")
{
window.location.href = "Page.aspx";
}
}
I executed and it works :) :D