insert data from datagridview or datatable

Question

Ok, after 2 days I got grid and max id from table working, now new problem: How to insert all products on the gridview which is also on datatable dtprodisp I got the first product inserted but don't know to do for loop and not repeat any already inserted product

private void Btngravar_Click(object sender, EventArgs e)
    {
        MySqlConnection conn = new MySqlConnection("ConnectionString");
        
        conn.Open();
        MySqlCommand objcmd = new MySqlCommand("insert into dispensacao (DESTINATARIO,COD_UNIDADE,COD_DEPARTAMENTO,DATA,SOLICITANTE,DEFERIDO_POR) values(?,?,?,?,?,?)", conn);
        objcmd.Parameters.Add("@DESTINATARIO", MySqlDbType.VarChar, 45).Value = Cmbdestinatario.Text;
        
        objcmd.Parameters.AddWithValue("@COD_UNIDADE", string.IsNullOrEmpty(Txtcodigounidade.Text) ? (object)DBNull.Value : Txtcodigounidade.Text);
        objcmd.Parameters.AddWithValue("@COD_DEPARTAMENTO", string.IsNullOrEmpty(Txtcodigodep.Text) ? (object)DBNull.Value : Txtcodigodep.Text);
       
        DateTime fdate = DateTime.Parse(Txtdata.Text);           
        objcmd.Parameters.Add("@DATA", MySqlDbType.DateTime).Value = fdate;
        objcmd.Parameters.Add("@SOLICITANTE", MySqlDbType.VarChar, 45).Value = Txtsolicitante.Text;
        objcmd.Parameters.Add("@DEFERIDO_POR", MySqlDbType.VarChar, 45).Value = Txtdeferido.Text;
        objcmd.ExecuteNonQuery();
        conn.Close();

        conn.Open();
       
        objcmd = new MySqlCommand("insert into produtos_disp(CODIGO_DISP,PRODUTO,QUANTIDADE,CODIGO_PROD) values (?,?,?,?)", conn);
        objcmd.Parameters.AddWithValue("@CODIGO_DISP", Cmbid.Text);
        objcmd.Parameters.AddWithValue("@PRODUTIO", dtproddisp.Rows[0]["descricao"]);
        objcmd.Parameters.AddWithValue("@QUANTIDADE", dtproddisp.Rows[0]["quantidade"]);
        objcmd.Parameters.AddWithValue("@COD_PRODUTO", dtproddisp.Rows[0]["codigo"]);
        
        objcmd.ExecuteNonQuery();       

   

        this.Close();
    }

this is the code and it works for the fist row

dtproddisp.Rows.Add(Txtcodigopro.Text, Txtproduto.Text, Txtquantidade.Text); 

Do I need to change that? the code to add data to dtprodisp DataTable is not geting the codigo for some reason, was working a few minutes ago and i din't change anything:

 private void Btnaddproduto_Click(object sender, EventArgs e)
    {

        dtproddisp.Rows.Add(Txtcodigopro.Text, Txtproduto.Text, Txtquantidade.Text);

        Gridprodutos.DataSource = dtproddisp;

    }

both other fields are working code to get "DESCRICAO" and "CODIGO":

private void Txtproduto_KeyUp(object sender, KeyEventArgs e)
    {
         if (e.KeyCode == Keys.Enter)
        {
            MySqlConnection connection = new MySqlConnection("connectionString");

            string selectQuery = "select descricao,codigo from produtos where barras =" + (Txtproduto.Text);
            connection.Open();
            MySqlCommand command = new MySqlCommand(selectQuery, connection);               
           
            MySqlDataReader reader = command.ExecuteReader();
            if(reader.Read())
            {
                Txtproduto.Text = reader.GetString("DESCRICAO");
                Txtcodigopro.Text = reader.GetString("CODIGO");
            }
           
           
        }

    }

Answer 1

After weeks i finally found the way to make it work;

for (int i = 0; i < dtproddisp.Rows.Count; i++)

        {
            objcmd = new MySqlCommand("insert into produtos_disp(CODIGO_DISP,PRODUTO,QUANTIDADE,CODIGO_PROD) values (?,?,?,?)", conn);
           
            objcmd.Parameters.AddWithValue("@CODIGO_DISP", Cmbid.Text);
            objcmd.Parameters.AddWithValue("@PRODUTIO", dtproddisp.Rows[i]["descricao"]);
            objcmd.Parameters.AddWithValue("@QUANTIDADE", dtproddisp.Rows[i]["quantidade"]);
            objcmd.Parameters.AddWithValue("@COD_PRODUTO", dtproddisp.Rows[i]["codigo"]);
            objcmd.ExecuteNonQuery();
        }

If anyone else has the same problem, I've posted my solution now i need to polish it, need to get max id from table, for now i i'n using a combobox with desc order to get it, but i believe there're a better way to do it