Why does DropDownList.SelectedValue is relied on viewstate?

Question

If I set on my page : EnableViewState=\"true\" ViewStateMode=\"Disabled\" - Then - the Viewstate is disable for the page ( unless override...)

The

Answer 1

      protected void Page_Load(object sender, EventArgs e)
            {
                (!Page.IsPostBack)
                {
                    string qry = "SELECT TOP(5)xxx, xxxx FROM dbo.xxxxxx ";
                    DataSet ds = new DataSet();
                    ds = SqlHelper.ExecInDS(qry);
                    drpDwn.DataSource = ds.Tables[0];
                    drpDwn.DataValueField = Convert.ToString(ds.Tables[0].Columns["xxx"]);
                    drpDwn.DataTextField = Convert.ToString(ds.Tables[0].Columns["xxx"]);                   
                    drpDwn.DataBind();
                }
               //Here You will get selected value from dropdown
               string sss= Request.Form["drpDwn"];
    }