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POCreate session in C#
 

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    <p>Hi I'm creating a login form from scratch in c# using 3 tiers. I've managed to build a working form that checks if the user data is correct. If he filled in the wrong data he'll get a message. But now I need to create a session to store the id. </p> <p>I've searched the web and they say you have to add <code>Session["sessionName"]= data</code>, but if I type <code>Session["userId"]=s.studentNummer</code> he doesn't recognize anything. Is it better to put the sessions in the DAL or in the DLL? I wanted to write it in the DAL (function checkLogin). Can somebody please help me?</p> <p>Here's my code:</p> <p>DALstudent.cs</p> <pre><code>public class DALstudent { dc_databankDataContext dc = new dc_databankDataContext(); public void insertStudent(Student s) { dc.Students.InsertOnSubmit(s); dc.SubmitChanges(); } public bool checkLogin(string ID, string passw) { bool canlogin = false; var result = (from s in dc.Students where s.studentNummer == ID &amp;&amp; s.studentPasswoord == passw select s).Count(); if (result == 1) { canlogin = true; } else { canlogin = false; } return canlogin; } } </code></pre> <p>BLLstudent.cs</p> <pre><code>public class BLLstudent { DALstudent DALstudent = new DALstudent(); public void insertStudent(Student s) { DALstudent.insertStudent(s); } public string getMD5Hash(string passwd) { MD5CryptoServiceProvider x = new MD5CryptoServiceProvider(); byte[] bs = Encoding.UTF8.GetBytes(passwd); bs = x.ComputeHash(bs); StringBuilder str = new StringBuilder(); foreach (byte b in bs) { str.Append(b.ToString("x2").ToLower()); } string password = str.ToString(); return password; } public bool checkLogin(string ID, string passw) { bool canlogin = DALstudent.checkLogin(ID, passw); if (canlogin == true) { return true; } else { throw new Exception("Uw gegevens kloppen niet"); } } } </code></pre> <p>login.aspx.cs</p> <pre><code>public partial class web_login : System.Web.UI.Page { protected void btnLogin_Click(object sender, EventArgs e) { try { BLLstudent BLLstudent = new BLLstudent(); var loginNr = txtLoginNr.Text; var pass = BLLstudent.getMD5Hash(txtWachtwoord.Text); var passw = pass; BLLstudent.checkLogin(loginNr, passw); Response.Redirect("student/s_procedure_goedkeuring.aspx"); } catch (Exception Ex) { lblFeedback.Text = Ex.Message; } } } </code></pre>
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    1. USNathalie De Hertogh
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    1. COPlease elaborate on "he doesn't recognise anything." Also, session state doesn't go in the DAL or the BLL. It belongs squarely in the web application.
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      1. USDavid
    2. COis your userid same as id that user uses to login? if yes then you can directly access it using HttpContext.Current.User.Identity.Name.ToString() whenever you want id data, without need of storing that in session
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    3. COMD5 is not a secure hash. Use SHA1 or SHA2 and don't forget to salt.
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      1. USBengie
 

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