How do I display date in a particular format in my asp.net dropdownlist in a particular format?

@DATE date = (CONVERT(varchar,dateadd(d,-(day(getdate())),getdate()),106))

protected void Page_Load(object sender, EventArgs e)
{
    using (SqlConnection conn = new SqlConnection(dbConn))
    {
        try //Call stored procedure
        {

            SqlCommand cmd = new SqlCommand(spddl, conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            if (!IsPostBack)
            {
                DATE_DOWN_LIST.DataSource = ds.Tables[0];
                DATE_DROP_DOWN_LIST.DataTextField = ds.Tables[0].Columns["DATA_DATE"].ToString();
                DATE_DROP_DOWN_LIST.DataBind();

            }

        }

        catch (Exception i)
        {
            bool exception = true;
            if (exception == true)
            {
                //txtMessage.Text += e.Message;
            }
        }
    }
}