SharePoint - How to set default value in DropDownMenu which takes data in SPList?

Question

I Have list "Department" and takes the data from it. I want the first value in DropDownMenu to be "Not a dept"...

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protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            using (SPSite site = new SPSite("http://sf-spsdev04/sites/sitecolection/"))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    SPList list = web.Lists["Departments"];
                    dropDep.DataSource = list.Items;
                    dropDep.DataValueField = "Title";
                    dropDep.DataTextField = "Title";
                    dropDep.DataBind();
                }
            }
        }
    }

Answer 1

Add below line of code under dropDep.DataBind();

ListItem newItem = new ListItem("Not a dept", "0");
dropDep.Items.Insert(0, newItem);