public int InsertData(string berat_filter, string qty, string nama_barang, string dari, string shift)
 {
     sql = @"insert into tb_timbang
          (BERAT_FILTER,QTY,NAMA_BARANG,DARI,SHIFT) 
          values (@berat_filter,@qty,@nama_barang,@dari,@shift)";
     try
     {
         using (MySqlConnection cnn = Koneksi.GetConnection())
             using (MySqlCommand cmd = new MySqlCommand(sql, cnn))
             {
                 cmd.Parameters.Add("@berat_filter", MySqlDbType.VarChar).Value = berat_filter;
                 cmd.Parameters.Add("@qty", MySqlDbType.VarChar).Value          = qty;
                 cmd.Parameters.Add("@name_barang", MySqlDbType.VarChar).Value  = nama_barang;
                 cmd.Parameters.Add("@dari", MySqlDbType.VarChar).Value         = dari;
                 cmd.Parameters.Add("@shift", MySqlDbType.VarChar).Value        = shift;
                 return(cmd.ExecuteNonQuery());
             }
         catch (Exception ex)
         {
             MessageBox.Show("error " + ex.Message);
             return(-1);
         }
     }