Updating from a label inserting sql query

Question

Hi!

I have on a form a label where appear one data after making filter. Then I would like to know how can I take this information appearing on that label to upadate on my sql query.
Please see my idea from this code (its desnt works):

comm = new OleDbCommand();

                conn.Open();

                OleDbParameter anex = new OleDbParameter("@anex", SqlDbType.NChar);

                comm.Parameters.Add(anex);

                anex.Value= lblAnex.Text;

                comm.Connection = conn;

                comm.CommandText = "UPDATE 1 SET [anexo]= lblAnex.Text WHERE ISNULL([anex]) OR [anex]='0'";// it's on this line

                comm.ExecuteNonQuery();

                conn.Close();