“System.StackOverflowException”类型的未经处理的异常在 BLL.dll 中发生，使用的是Visual Studio 2012的，在输入用户名和密码后点击登陆，就会出现堆栈的问题，麻烦各位大哥帮忙看下是哪里出现问题了？谢谢！！
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Models;
using DAL;
using System.Web;

namespace BLL
{
    public class SysAdminManger
    {
        //根据用户名和密码查询
        public SysAdmin AdminLogin(SysAdmin objAdmins)

        {
            objAdmins = new SysAdminManger().AdminLogin(objAdmins);//这段代码出现堆栈
            if (objAdmins!= null)
            {
                HttpContext.Current.Session["currentName"] = objAdmins;
            }
                return (objAdmins);
        }
    }
}


<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<dynamic>" %>

<!DOCTYPE html>

<html>
<head runat="server">
    <meta name="viewport" content="width=device-width" />
    <title>AdminLogin</title>
</head>
<body>
    <div>
        <form action="/SysAdmin/AdminLogin" method="post">
            用户名：<input type="text" name="loginld" />
            密码：<input type="text" name="password" />
            <input type="submit" value="登陆" />

        </form>
        <%=ViewData["info"] %>
    </div>
</body>
</html>


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Models;
using BLL;

namespace KKS.Controllers
{
    public class SysAdminController : Controller
    {
        //
        // GET: /SysAdmin/

        public ActionResult Index()
        {
            return View("AdminLogin");
        }
        public ActionResult AdminLogin()
        {
            //获取到页面的数据
            SysAdmin objAdmins = new SysAdmin()
            {
                loginld = Convert.ToInt32(Request.Params["loginld"]),
                password = Request.Params["password"]
            };
            //调用业务逻辑
            objAdmins = new SysAdminManger().AdminLogin(objAdmins);
            if (objAdmins!= null)

            {
                ViewData["info"] = "欢迎你！" + objAdmins.Admins;
            }
            else
            {
                objAdmins =  null;
            }
            return View();
        }

    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Models;
using System.Data;
using System.Data.SqlClient;
namespace DAL
{
    public class SysAdminService
    {
        //根据用户名和密码来查询
        public SysAdmin AdminLogin(SysAdmin objAdmins)
        {
            string sql ="select l_name from Admins where l_name='{1}";
            sql = string.Format(sql, objAdmins.Admins, objAdmins.loginld,objAdmins.password);

            //查询
            try
            {
                SqlDataReader objReader=Helper.SqlHelper.GetReader(sql);
                if(objReader.Read())
                {
                    objReader["Adminname"].ToString();
                    objReader.Close();

                }
                else
                {
                    objReader = null;
                }
            }
            catch(Exception ex)
                {
                    throw new Exception("应用程序或数据库出错"+ex.Message);
                }
            return objAdmins;
            
        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace DAL.Helper
{
    //数据通用类
    public class SqlHelper
    {
        //连接字符串connString
        private static readonly string connString = ConfigurationManager.ConnectionStrings["connString"].ToString();
        public static int Update(string sql)
        {
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                return cmd.ExecuteNonQuery();
               // int result= cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
            }

            
        }
        //执行单一的结果查询
        public static object GetSingleResult(string sql) 
        {
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                return cmd.ExecuteScalar();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
            }
        }
        //结果集的查询
        public static SqlDataReader GetReader(string sql) 
        {
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                return cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                conn.Close();
                throw ex;
            }
            
        }
    }
}
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