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بسم الله الرحمن الرحيم 

اخي الكريم هذا مثال اشتغلتوا بمشروع التخرج :
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Windows.Forms;

/// <summary>
/// Summary description for PublicFunctions
/// </summary>
public class LoginFunctions
{
    private static DBClassesDataContext db = new DBClassesDataContext();
    private static HttpContext BR;
    public LoginFunctions()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    //Check If Account Exist In The DataBase
    public static bool CheckUser(string name, string pass)
    {
        var theaccount = from account in db.Accounts
                         where (account.UserName == name) && (account.PassWord == pass)
                         select account;
        if (theaccount.Count<Account>() > 0)
            return true;
        else
            return false;
    }
    public static AccountType GetType(string name)
    {
        var theaccount = from account in db.Accounts
                         where (account.UserName == name)
                         select account;
        if (theaccount.Count<Account>() > 0)
        {
            foreach (var i in theaccount)
            {
                return SetAccountType(((Account)i).Privilege);
            }
        }
        return AccountType.unknown;
    }
    // Convert String to AccountType
    public static AccountType SetAccountType(string type)
    {
        AccountType Result = AccountType.unknown;
        Result = (AccountType)Enum.Parse(typeof(AccountType), type);
        return Result;
    }
    //Remove Cookie
    public static void DeleteCookie()
    {
        BR = HttpContext.Current;
        //Give The Cookie Expired Expiration Date To Let The Browser Delete It
        if (BR.Request.Cookies["HMS_ACC"] != null)
        {
            HttpCookie myCookie = new HttpCookie("HMS_ACC");
            myCookie.Expires = DateTime.Now.AddDays(-1d);
            BR.Response.Cookies.Add(myCookie);
        }
    }
    //Create Session
    public static void CreateSession(string name, string pass)
    {
        BR = HttpContext.Current;
        BR.Session.Add("UserName", name);
        BR.Session.Add("Password", pass);
        BR.Session.Add("Privilege", GetType(name).ToString());
    }
    //Create Cookie
    public static void CreateCookie(string name, string pass)
    {
        BR = HttpContext.Current;
        //Create a new cookie, passing the name into the constructor
        HttpCookie cookie = new HttpCookie("HMS_ACC");
        cookie.Values.Add("UserName", name);
        cookie.Values.Add("Password", pass);
        cookie.Values.Add("Privilege", GetType(name).ToString());
        //Set the cookie to expire in 2 Weeks
        DateTime dtNow = DateTime.Now;
        TimeSpan tsMinute = new TimeSpan(14, 0, 0, 0);
        cookie.Expires = dtNow + tsMinute;

        //Add the cookie
        BR.Response.Cookies.Add(cookie);
    }
    //Assure if we can get in the page
    public static bool CanGetIn()
    {
        BR = HttpContext.Current;
        //Prepare Cookie If Exist
        HttpCookie cookie = BR.Request.Cookies["HMS_ACC"];
        //Session
        if (BR.Session.Count > 0)
        {
            if (!LoginFunctions.CheckUser(BR.Session["UserName"].ToString(), BR.Session["Password"].ToString()))
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        //Cookie
        else if (cookie != null)
        {
            if (String.IsNullOrEmpty(cookie.Values[0].ToString()))
            {
                LoginFunctions.DeleteCookie();
                return false;
            }
            else
            {
                if (LoginFunctions.CheckUser(cookie.Values["UserName"].ToString(), cookie.Values["Password"].ToString()))
                {

                    LoginFunctions.CreateSession(cookie.Values["UserName"].ToString(), cookie.Values["Password"].ToString());
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }
        else
        {
            return false;
        }
    }
    //Get StructureID
    public static int GetStructureId(int AccountID)
    {
        var TheResult = from employ in db.Employees
                        where (employ.Account_ID == AccountID)
                        select new { theid = employ.Section_ID };
        foreach (var s in TheResult)
        {
            return s.theid;
        }
        return -1;
    }
    //Get Account ID
    public static int GetAccountID(string name)
    {
        var theaccount = from account in db.Accounts
                         where (account.UserName == name)
                         select new {theID = account.ID};
        foreach (var s in theaccount)
        {
            return s.theID;
        }
        return -1;
    }
}

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