如何在一个会话中存储多个选定的列表框项目并在其他表单上查看？

Question

The thing I want to do is that i want to select 1,2 or 3 items from the listbox and save them into a session and then display them all on another form in a listbox.

Here's my code! This is my first post on stack overflow, so no hate please <3

    //WebForm1

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            lstProducts.Items.Add("Soap");
            lstProducts.Items.Add("Schampoo");
            lstProducts.Items.Add("Conditioner");
        }
    }

    protected void cmdBuy_Click(object sender, EventArgs e)
    {
            string[] products = new string[3];

            for (int i = 0; i < lstProducts.Items.Count; ++i)
            {
                if (lstProducts.Items[i].Selected)
                    products[i] = lstProducts.Items[i].Text;
                else
                    products[i] = "0";
            }

            Session["Cart"] = products;

    }

    protected void cmdCart_Click(object sender, EventArgs e)
    {
        if (Session["Cart"] != null)
        {
            Response.Redirect("WebForm2.aspx");
        }
    }
}


    //WebForm2


    protected void Page_Load(object sender, EventArgs e)
    {
        string[] products = (string[])Session["Cart"];

        for (int i = 0; i < 3; ++i)
        {
            if (products[i] != "0")
            {
                lstCart.Items.Add(products[i]);
            }
        }
    }
}
}

The thing is that I only get the last selected item to display in the listbox on form2???

Answer 1

Try this

To store all items of the of the list box, you can add that items in array as:

string[] a = new string[]{"item 1","item 2","item 3"};
Session["values"] = a;

And in the next page, you can retrieve it like this.

string[] a = (string[])Session["values"]

EDIT #1

your case you can do like

        ArrayList al = new ArrayList();
        for (int i = 0; i < ListBox1.Items.Count; i++)
        {
            if (ListBox1.Items[i].Selected == true)
            {
                al.Add(ListBox1.Items[i].Value);
            }
        }
        Session["selectedValues"] = al;

now you can use this sessiom variable in another page, but don't forget to cast in ArrayList type of object.