Cannot update records...

Hi!

Why I cannot update my record on my database. I receive this message (not saved). Please have a look on my codes to see if somethink is wrong.

private void btnUpdate_ProdutoStock_Click(object sender, EventArgs e)

{

conn = new SqlConnection(connstr);

comm = new SqlCommand();

conn.Open();

SqlParameter code = new SqlParameter("@cod", SqlDbType.VarChar);

SqlParameter product = new SqlParameter("@prod", SqlDbType.NChar);

SqlParameter price = new SqlParameter("@price", SqlDbType.NChar);

SqlParameter n_stock = new SqlParameter("@stock", SqlDbType.NChar);

comm.Parameters.Add(code );

comm.Parameters.Add(product );

comm.Parameters.Add(price );

comm.Parameters.Add(n_stock);

code .Value = codigoBarraStocks.Text;

product .Value = produtoStocks.Text;

price .Value = precoStocks.Text;

n_stock.Value = nStocksStocks.Text;

comm.Connection = conn;

comm.CommandText ="UPDATE consult SET code = @cod, product= @prod, price = @preco, n_stock= @stock WHERE (code = @cod)";

try

{

comm.ExecuteNonQuery();

MessageBox.Show("Saved");

}

catch (Exception)

{

MessageBox.Show("Not saved");

}

finally

{

conn.Close();

}