Menu.aspx.cs

 using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

namespace TestGrounds
{
    public partial class Menu : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            DisplayUser();
            CheckRemoveSelected();
            SaveMenuSelection();
            LoadMenu();
            CalcSum();
            //SetMenuImg();
            //HideShowControllers();
            pizza1.Visible = false;

        }

        private void SetMenuImg()
        {
            //lblTest.Text = gvwMenu.fi
        }

        private void HideShowControllers()
        {
            if (Session["order"] == null)
            {
                pnlHideShow.Visible = false;
            }
            else
            {
                pnlHideShow.Visible = true;
            }
        }

        private void CalcSum()
        {
            int sum = 0;
            Order o = new Order();
            o = (Order)Session["order"];
            if (o != null)
            {
                foreach (Pizza item in o.pizzas)
                {
                    sum += item.price;
                }
            }
            Session["sum"] = sum;
            lblSum.Text = "Totalt Belopp: " + sum.ToString();
        }

        private void SaveMenuSelection()
        {
            if (lstMenuName.SelectedItem != null)
            {
                string selected = lstMenuName.SelectedItem.ToString();
                Session["selectedmenu"] = selected;
            }
        }
        private void DisplayUser()
        {
            if (Session["user"] != null)
            {
                lblLoggedUser.Text = "Welcome! " + Session["user"];
                lblLoggedUser.Visible = true;
            }
        }
        private void LoadMenu()
        {
            lstMenuName.Items.Clear();
            SqlDataReader reader = FetchWriteData("SELECT * FROM menu");
            while (reader.Read())
            {
                string formatted = reader["price"].ToString() + ":- " + reader["name"].ToString();
                lstMenuName.Items.Add(formatted);
            }
        }

        private void CheckRemoveSelected()
        {
            if (lstMenuCart.SelectedItem != null)
            {
                string selected = lstMenuCart.SelectedItem.ToString();
                Session["selected"] = selected;
            }
            else
            {
                Session["selected"] = null;
            }
            lstMenuCart.Items.Clear();
            Order currentOrder = getOrder();
            if (currentOrder != null)
            {
                foreach (Pizza element in currentOrder.pizzas)
                {
                    lstMenuCart.Items.Add(element.name);
                }
            }
            else
            {
                lstMenuCart.Items.Add("- The Cart is Empty -");
            }
        }

        private void RemoveAll()
        {
            lstMenuCart.Items.Clear();
            //Order o = new Order();
            Session["Order"] = null;
            lstMenuCart.Items.Add("- The Cart is Empty -");
        }


        protected void btnMenuLegge_Click(object sender, EventArgs e)
        {
            Order currentOrder = new Order();
            currentOrder = getOrder();
            Pizza p = new Pizza();

            p.name = "invalid pizza";
            p.price = 19;
            if (Session["selectedMenu"] != null)
            {
                p.name = Session["selectedMenu"].ToString();
                lblSum.Text = Session["selectedMenu"].ToString().Substring(0, 2);
                p.price = Int32.Parse(lblSum.Text);
            }
            currentOrder.pizzas.Add(p);
            Session["order"] = currentOrder;
            Response.Redirect("~/Menu.aspx");

        }
        protected Order getOrder()
        {
            Order o = new Order();
            o = (Order)Session["order"];
            if (o == null)
            {
                Order newOrder = new Order();
                o = newOrder;
                List<Pizza> pizzalist = new List<Pizza>();
                o.pizzas = pizzalist;
            }
            return o;
        }

        protected void btnRemove_Click(object sender, EventArgs e)
        {
            if (Session["selected"] != null)
            {
                string selected = Session["selected"].ToString();
                Order currentOrder = new Order();
                currentOrder = getOrder();
                foreach (Pizza element in currentOrder.pizzas)
                {
                    if (element.name == selected)
                    {
                        currentOrder.pizzas.Remove(element);
                        Response.Redirect("~/Menu.aspx");
                        break;
                    }
                    Session["order"] = currentOrder;
                }
            }
        }

        private SqlDataReader FetchWriteData(string sql)
        {
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = WebConfigurationManager.ConnectionStrings["MinConn"].ConnectionString;
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlDataReader reader = cmd.ExecuteReader();
            return reader;
        }

        protected void btnRemoveAll_Click(object sender, EventArgs e)
        {
            RemoveAll();
        }

        protected void btnCheckOut_Click(object sender, EventArgs e)
        {
            if (Session["user"] == null || Session["user"].ToString() == "guest")
            {
                Session["message"] = "Please log in to finalize your order";
                Response.Redirect("~/LogIn.aspx");
            }
            if (Session["order"] != null)
            {
                Response.Redirect("~/CheckOut.aspx");
            }
        }
    }
}