MSDE Database Not Updating

I'm trying to build a record update form and I'm
going off the "Build Your Own ASP.NET Website" book. I'm not getting
any compilation errors; the database just doesn't update.

void Update(Object s, EventArgs e) {
    SqlConnection upConn = new SqlConnection(
        "Server=****\netsdk; database=CLASSIFIEDS; User ID=****; Password=****;");
    SqlCommand upCmd;
    upCmd = new SqlCommand("UPDATE CLASSIFIEDUSER SET
ITEMHEADLINE=@ITEMHEADLINE, ITEMDESCRIPTION=@ITEMDESCRIPTION,
CONTACTNAME=@CONTACTNAME, EMAIL=@EMAIL, HOMEPHONE=@HOMEPHONE,
WORKPHONE=@WORKPHONE, CELLPHONE=@CELLPHONE, BUILDING=@BUILDING,
ROOM=@ROOM, PRICE=@PRICE WHERE ID=@ID", upConn);
    upCmd.Parameters.Add("@ITEMHEADLINE", headline.Text);
    upCmd.Parameters.Add("@ITEMDESCRIPTION", description.Text);
    upCmd.Parameters.Add("@CONTACTNAME", contact.Text);
    upCmd.Parameters.Add("@EMAIL", email.Text);
    upCmd.Parameters.Add("@HOMEPHONE", home.Text);
    upCmd.Parameters.Add("@WORKPHONE", work.Text);
    upCmd.Parameters.Add("@CELLPHONE", cell.Text);
    upCmd.Parameters.Add("@BUILDING", building.Text);
    upCmd.Parameters.Add("@ROOM", room.Text);
    upCmd.Parameters.Add("@PRICE", price.Text);
    upCmd.Parameters.Add("@ID", Request.QueryString["id"]);
    upConn.Open();
    upCmd.ExecuteNonQuery();
    upConn.Close();
   
    Response.Redirect("preview.aspx?id=" + Request.QueryString["id"]);
}

The Response.Redirect works so I'm thinking there must be an SQL syntax error or something but I can't see it.