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我有一个ASP.net MVC 4站点，它在第一次请求时变慢了。我在运行应用程序时尝试了断点。在登录过程中，它在我的第一个数据库查询中几乎停留了一分钟：

  var InstnCode = form["code"].ToString();
  var ComAccount = Context.Companies.Where(x => x.CompanyCode == InstnCode);

之后一切顺利。

为什么会这样，我该如何纠正这个过程。由于这个问题，有时我会得到一个Server Timeout error.

  [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
       public ActionResult Login(UserProfile model, string returnUrl, FormCollection form)
       {

        var InstnCode = form["code"].ToString();
        var ComAccount = Context.Companies.Where(x => x.CompanyCode == InstnCode);

        if (ComAccount.Any())
        {
            var modelvalue =
                (from d in Context.UserProfiles
                    where d.UserName == model.UserName && d.Password == model.Password && d.Company.CompanyCode == InstnCode
                    select d).FirstOrDefault();


            if (modelvalue != null)
            {
                string code = null;

                Session["UName"] = modelvalue.UserName;
                Session["Theme"] = modelvalue.Theme;
                Session["InstnName"] = modelvalue.Company.CompanyName;
                Session["Role"] = modelvalue.Role.RoleName;
                Session["StartUp"] = modelvalue.StartUp;

                var permission =
                    Context.AccountPermissions.Where(x => x.RoleId == modelvalue.RoleId)
                        .AsQueryable()
                        .FirstOrDefault();

                if (permission != null)
                {
                    SetSessions(permission, "yes");
                }
                else
                {
                    SetSessions(permission, "no");
                }

                if (modelvalue.CompanyId != 0 && modelvalue.StaffId == null && modelvalue.StudentProfileId == null)
                {
                    Session["ComID"] = modelvalue.CompanyId;
                    code = modelvalue.Company.CompanyCode;

                }
                else if (modelvalue.CompanyId != 0 && modelvalue.StudentProfileId != null)
                {
                    var student =
                        (from d in Context.StudentProfiles
                            where d.StudentProfileId == modelvalue.StudentProfileId
                            select d).FirstOrDefault();
                    code = student.Company.CompanyCode;
                    Session["ComID"] = student.CompanyId;
                }
                else if (modelvalue.CompanyId != 0 && modelvalue.StaffId != null)
                {
                    var staff =
                        (from d in Context.Staff where d.StaffId == modelvalue.StaffId select d).FirstOrDefault();
                    code = staff.Company.CompanyCode;
                    Session["ComID"] = staff.CompanyId;
                    Session["StaffID"] = staff.StaffId;
                }


                    return RedirectToLocal(returnUrl);



            }
            else
            {
                ModelState.AddModelError("", "The user name or password provided is incorrect");
                return View(model);
            }

        }
        ModelState.AddModelError("", "The institution code provided is incorrect");
        return View(model);
    }

这是我的登录功能。我正在使用 @using (Html.BeginForm("Login", "Account", FormMethod.Post, new { enctype = "multipart/form-data" }))我的登录表单。

任何帮助将不胜感激。提前致谢

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