说帮我把下面的ASP.NET代码加上注释。

Question

String md5pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "md5");
        try
        {
            con.Open();
            OleDbCommand com = new OleDbCommand("select * from Admin_Users where Admin_User_Name='" + user + "' and Admin_User_Pwd='" + md5pwd + "'", con);
            OleDbDataReader dr = com.ExecuteReader();
            if (dr.Read())
            {
                HttpCookie usersCookie = new HttpCookie("user", dr["Admin_User_Name"].ToString());
                Response.Cookies.Add(usersCookie);
                Response.Redirect("Default.aspx");
            }
            else
            {
                Response.Write("<script>alert('用户名或密码错误！');</script>");
            }
        }
        catch (Exception ex)
        {
            Response.Write("<script>alert('" + ex.Message + "');</script>");
        }
        finally
        {
            con.Close();
        }

Answer 1

//登陆，成功记录cookie，否则提示失败
String md5pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(pwd, "md5"); 
        try 
        { 
            //操作数据库
            con.Open(); 
            OleDbCommand com = new OleDbCommand("select * from Admin_Users where Admin_User_Name='" + user + "' and Admin_User_Pwd='" + md5pwd + "'", con); 
            OleDbDataReader dr = com.ExecuteReader(); 
            if (dr.Read()) 
            { 
                HttpCookie usersCookie = new HttpCookie("user", dr["Admin_User_Name"].ToString()); 
                Response.Cookies.Add(usersCookie); 
                Response.Redirect("Default.aspx"); 
            } 
            else 
            { 
                Response.Write(" <script>alert('用户名或密码错误！'); </script>"); 
            } 
        } 
        catch (Exception ex) 
        { 
            Response.Write(" <script>alert('" + ex.Message + "'); </script>"); 
        } 
        finally 
        { 
            con.Close(); 
        }