autocomplete in derived textbox

If I have a custom control that derives from textbox, how would I ensure that autocomplete is turned off?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;


//Taken from
//
//http://www.codeproject.com/KB/custom-controls/ASPNET_Password_TextBox.aspx

namespace Campus_Webstore
{

    public class PasswordTextBox : TextBox
    {
        public PasswordTextBox()
        {
            TextMode = TextBoxMode.Password;
        }

        public override string Text
        {
            get
            {
                return base.Text;
            }
            set
            {
                base.Text = value;

                Attributes["value"] = value;
            }
        }

        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);

            Attributes["value"] = Text;
        }
    }
}

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