Update i Acces

får denne fejl:
Operation must use an updateable query.

her er min update funk:
        public void UpdatePrice(Object Sender,EventArgs e)
        {
            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" +
                "Data Source=c:\\Program Files\\Microsoft Office\\Office\\Samples\\Nwind.mdb;" +
                "User ID=;Password=;");

            con.Open();

            //Build update command
            //string sqlQ = "Update Products Set UnitPrice = " + Price.Text + " where ProductName = '" + Name.Text + "'";
            string sqlQ1 = "Update Products Set UnitPrice = 22 where ProductName = 'Chang'";
            OleDbCommand cmd = new OleDbCommand(sqlQ1, con);

            int nRowsAffected = 0;

            nRowsAffected = cmd.ExecuteNonQuery();

            Status.Text = "<hr />" + nRowsAffected.ToString() + "rows has been changed";
        }
    }

Det kan da ikke være helt forkert :-)