Custom SessionManager, a better way of handling your session variables.

This is a custom built reusable SessionManager Class to keep track of all the used session variables in a web application. You don’t need to remember them or type them by hand every time you need to access them and with typed dataset rows, life becomes allot more easier but above all there is no need of casting where ever you access a session object, believe me, that’s the best part.

public class SessionManager
{
    //set the login status in session for the current user.
    public static void setIsLoggedIn(bool value)
    {
        //value is true when the the usser logs in
        HttpContext.Current.Session[“isLoggedIn”] = value;
        //value is false when the the usser logsout
        if (!value)
            HttpContext.Current.Session[“isLoggedIn”] = null;
    }

     //check to see if the user is logged in

    public static bool isLoggedIn()

    {

        if (HttpContext.Current.Session[“isLoggedIn”].Equals(null))

            return false;

        else

            return true;

    }   

 

    //set current employee in the sessoin

    public static void setCurrentEmployee(dsEmployees.EmployeesRow value)

    {

        HttpContext.Current.Session[“Employee”] = value;

        if (value != null)

        {

            //following variables are set separately to be used in bindable control like

            //GridView, DataList etc..

            HttpContext.Current.Session[“EmployeeId”] = value.EmployeeId;

            HttpContext.Current.Session[“Name”] = value.FirstName + ” “ +

                value.MiddleName + ” “+ value.LastName;

        }

    }

 

    //get current employee fro the session

    public static dsEmployees.EmployeesRow getCurrentEmployee()

    {

        return(dsEmployees.EmployeesRow)HttpContext.Current.Session[“Employee”];

    }

 

   

    //bonus functions – to be used on the pages where it is neccessary for the users to login

    public static void setRedirectUrl(stringredirectURL)

    {

        HttpContext.Current.Session[“redirectURL”] = redirectURL;

    }

 

    //bonus functions – once the users log in, they will be redirected back to the previously

    //stored url or redirected to the default page

    public static stringgetRedirectUrl()

    {

        if (object.Equals(HttpContext.Current.Session[“redirectURL”], null))

            return “myaccount.aspx”;

        else

            return HttpContext.Current.Session[“redirectURL”].ToString();

    }

}

Analyze one thing that setCurrentEmployee is taking the entire typed dataset’s row of the currently logged in user. This practice helps a great deal to quickly access any value from the currently logged in user’s details instead of hitting the database again and again and of course, typed datarow helps you avoid any mistakes in writing field names 🙂

Here is a sample code to set and get login sessoin variables.

protected voidLogin()

 

    {

        Page.Validate();

 

        if(!Page.IsValid)

            return;

 

        dsEmployeesTableAdapters.EmployeesTableAdapter ta = new dsEmployeesTableAdapters.EmployeesTableAdapter();

        dsEmployees.EmployeesDataTable dt = ta.Login(txtuid.Text.Trim(), txtPassword.Text.Trim());

        if(dt.Rows.Count > 0)

        {

            dsEmployees.EmployeesRow row = dt[0];

 //set current user as logged in

                EmployeeSession.setIsLoggedIn(true); 

 

                EmployeeSession.setRedirectUrl(null); 
                Response.Redirect(rediectURL); 
        }

 

 

    return;

    }

Now it is very easy to check if the user is logged in.

//check if the user is logged in

        if (!EmployeeSession.isLoggedIn())

        {

            //store current url and redirect to the login page

            stringurl = Request.Url.AbsoluteUri.ToString();

            EmployeeSession.setRedirectUrl(url);

            Response.Redirect(“login.aspx”);

        }

Accessing the data of the currently logged in user is piece of cake now. 

          //check if the user is logged in
            if (EmployeeSession.isLoggedIn())
            {
                //display the name of the user from the session object
                lblName.Text = SessionManager.getCurrentEmployee().Name;
            }

Hope it helps, if you need more on it, drop me a few lines.

Cheers –

 

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