求解，ASP.Net MVC Redirect 无法跳转问题

$.post("/Home/CheckLogin", { "username": $("#username").val(), "password": $("#password").val(), "role": $("#roleSelect").val() }, function (returnString) {
if (returnString == "Error1") {
$("#password").val() = "";
alert("用户名或者密码错误！");
} else if (returnString == "Error2") {
alert("该用户被禁用，请与管理员联系！");
} else if (returnString == "Error3") {
alert("登录异常，请重试！");
}
else {
alert(returnString);
}
});

if(result == "Success")
{
//登录验证成功，写session,返回用户视图
Session["Role"] = "Student";
Session["UserNum"] = username;
//return RedirectToAction("StudentInfo");
return Redirect("StudentInfo");
}