Dropdown listbox and auto-postback problem

[Robel Tareke]

I have a dropdown listbox whose datasource is a dictionary.
When I have added items to the list and try to select an item from the list, the item I selected does not get the focus. And this comes when I changed the property autopostback to true.
Here are some of the codes which are relevant to it.

 
protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
                LoadList();
        }
private void LoadList()
        {
            cbxProduct.DataSource = Supplies;
            if (!IsPostBack)
            { 
                Supplies.Add("Banana", 1);
                Supplies.Add("Annana", 1);
                cbxProduct.DataTextField = "Key";
                cbxProduct.DataValueField = "Value";
            }
            cbxProduct.DataBind();
        
        }
        public Dictionary<string, int> Supplies
        {
            get
            {
                if (Page.Session["supplies"] == null)
                {
                    Dictionary<string, int> supplies = new Dictionary<string, int>();
                    Page.Session["supplies"] = supplies;
                   
                }
                return (Dictionary<string, int>)Page.Session["supplies"];
            }
            set
            {
                Page.Session["supplies"] = value;
            }

        }

[Bassem]

Hi, shouldn't line #9 be moved under the if-statement on the top of the DataBind Method? Also, why you double check the IsPostBack.

I think when you set the property autopostback to true the ComboBox will be reset to have its original datasource, because of the post back.