小弟目前還在自學MVC的 Coding，已經做好登入登出跟註冊系統，可是現在差在要『修改會員資料』與『修改密碼』。
我的想法是把登入的資訊(包括數量Num跟帳號ID值)抓出來，我驗證登入的方式是抓取Session，可是我從ChangePassword中，抓出的Session值是亂碼，無法抓到正確的登入帳號相關資訊，請問各位有甚麼方法可以從controller中抓取帳號的資訊嗎？

我的改密 Model:

public class ChangePassword
    {
        [Required]
        [DataType(DataType.Password)]
        [Display(Name ="舊密碼")]
        public string OldPassword { get; set; }

        [Required]
        [DataType(DataType.Password)]
        [Display(Name = "新密碼")]
        public string NewPassword { get; set; }

        [Required]
        [DataType(DataType.Password)]
        [Display(Name = "再次確認新密碼")] 
        [Compare("NewPassword", ErrorMessage = "新密碼與確認密碼不相符。")]
        public string ConfirmPassword { get; set; }
        
        public int ID { get; set; }
        public string ChangePasswordErrorMsg {get;set;}

***我的改密 View：

@model MenberSystem.Models.ChangePassword
@{
    ViewBag.title = "變更密碼";
    if (Session["menberID"] == null)
    {
        Layout = "_Layout.cshtml";
        Response.Redirect("~/Account/Login");
    }
}

<h2>@ViewBag.title</h2>
@using (Html.BeginForm("ChangePassword", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
    @Html.AntiForgeryToken()
    <h4>變更密碼表單</h4>
    <hr />
    @Html.ValidationSummary("", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(m => m.OldPassword, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.PasswordFor(m => m.OldPassword, new { @class = "form-control" })
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.NewPassword, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.PasswordFor(m => m.NewPassword, new { @class = "form-control" })
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.ConfirmPassword, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.PasswordFor(m => m.ConfirmPassword, new { @class = "form-control" })
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="變更密碼" class="btn btn-info" />
            <input type="reset" value="重新輸入" class="btn btn-warning" />
            <input type="button" value="上一頁" class="btn btn-dark" onclick="history.back()">
        </div>
    </div>
}
@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

我的登入 controller

   var menberDetail = db.Menber.Where(x => x.ID == menber.ID && x.Password == menber.Password).FirstOrDefault();
                if (menberDetail == null)
                {
                    menber.LoginMessLoginErrorMsg = "輸入錯誤 ";
                    TempData["message"] = "輸入錯誤，請重新輸入";
                    return View("Login", menber);

                }
                else
                {

                    Session["menberID"] = menber.ID;
                    TempData["message"] = "登入成功";
                    return RedirectToAction("Index", "Home");