How use custom class in WebMatrix v2? - asp.net

Question

I do first steps in the ASP.NET and I've a issue with classes. I would like to create a new custom class to support sessions and collect information about the number of users on my website.
I've created a class in file MySession.cs, which has been put in the dir called "App_data" by WebMatrix.
When I try to use this class in .cshtml file, it throws me information it couldn't found that class.
I found in the Web, the class should be placed in App_Code, so I've done it. However, in this moment it shows me an error that classes like "Request" couldn't been found.
How to use custom class in WebMatrix?
My c# code from .cshtml file looks like:
#{
MySession session = new MySession(60);
session.start();
var db = Database.Open("studia");
var data = db.Query("SELECT COUNT(*) as total FROM sessions");
}
and class file looks like:
using System;
using System.Collections.Generic;
using System.Web;
using System.Security.Cryptography;
using System.Data;
using System.Data.SqlClient;
/// <summary>
/// Summary description for sesss
/// </summary>
public class MySession
{
private String _session_id;
private int _session_time;
public MySession(int session_time = 60)
{
_session_time = session_time;
using (MD5 md5Hash = MD5.Create())
{
_session_id = (Request.Cookies["session_id"] != null) ? Server.HtmlEncode(Request.Cookies["sesion_id"].Value) : GetMd5Hash(md5Hash, DateTime.Now);
}
cleanup();
}
public bool isLogged()
{
if (Request.Cookies["session_id"] != null)
{
return true;
}
return false;
}
public void start(string username)
{
DateTime now = DateTime.Now;
var db = Database.Open("studia");
if (isLogged())
{
db.Query("UPDATE sessions SET start_time = " + now + " WHERE session_id = " + _session_id);
}
else
{
db.Query("INSERT INTO sessions (id, start_time, username) VALUES ('" + _session_id + "', '" + now + "', '" + username + "'");
}
HttpCookie session_cookie = new HttpCookie("session_id");
session_cookie.Value = DateTime.Now;
session_cookie.Expires = DateTime.Now.AddSeconds(_session_time);
Response.Cookies.Add(aCookie);
}
public void cleanup()
{
var db = Database.Open("studia");
db.Query("DELETE FROM sessions WHERE start_time < " + (DateTime.Now - _session_time));
}
static string GetMd5Hash(MD5 md5Hash, string input)
{
// Convert the input string to a byte array and compute the hash.
byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
// Create a new Stringbuilder to collect the bytes
// and create a string.
StringBuilder sBuilder = new StringBuilder();
// Loop through each byte of the hashed data
// and format each one as a hexadecimal string.
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
// Return the hexadecimal string.
return sBuilder.ToString();
}
// Verify a hash against a string.
static bool VerifyMd5Hash(MD5 md5Hash, string input, string hash)
{
// Hash the input.
string hashOfInput = GetMd5Hash(md5Hash, input);
// Create a StringComparer an compare the hashes.
StringComparer comparer = StringComparer.OrdinalIgnoreCase;
if (0 == comparer.Compare(hashOfInput, hash))
{
return true;
}
else
{
return false;
}
}
}

Answer 1

If you want to refer to the Request object in a class (as opposed to from within a page file) you need to use HttpContext.Current e.g.
public bool isLogged()
{
return HttpContext.Current.Request.Cookies["session_id"] != null;
}