C# DataAdapter can´t seem to update my MySQL Table

Question

I´m trying to get my DataAdapter to update/insert new values to my table from another database (same table but different values) It should just copy the values from DB1 and insert/update them in DB2. I´m getting no compilation errors and the DataTables seems to have the correct values. But nothing gets updated or inserted.

So it should Fill a Datatable (dataTable1) from my database (DB1), then set all rows to be modified and insert them into DB2 But, it wont work.

    DataTable dataTable1 = new DataTable("counters");
    string command = "SELECT * FROM counters;"; // same layout and name on both tables

    using (MySqlConnection connectionFrom = new MySqlConnection(constringfrom)) // DB1
    {
        MySqlDataAdapter dataAdapter1 = new MySqlDataAdapter(command, connectionFrom);
        dataAdapter1.Fill(dataTable1);
    } 

    using (MySqlConnection ConnectionTo = new MySqlConnection(constringto)) // DB2
    {
        MySqlDataAdapter dataAdapter2 = new MySqlDataAdapter(command, ConnectionTo);
        MySqlCommandBuilder cmb2 = new MySqlCommandBuilder(dataAdapter2);
        dataAdapter2.UpdateCommand = cmb2.GetUpdateCommand();
        dataAdapter2.InsertCommand = cmb2.GetInsertCommand();
        foreach (DataRow r in dataTable1.Rows)
        {
            r.SetModified(); // just for testing purposes..
        }

        dataAdapter2.Update(dataTable1); // Correct values but no update to the DB :(
    }

    Console.WriteLine("Updating..... DONE"); // well... no