try
            {
                for (int i = 0; i < textboxes.Count; i++)
                {
                    var value = textboxes[i];
                    var column = labels[i];
                    MySqlCommand cmd = connection.CreateCommand();
                    cmd.CommandText = "INSERT INTO firmenkunden ("+column.Name+") VALUES ('"+value.Text+"')";
                    cmd.ExecuteNonQuery();
                }
                MessageBox.Show("Der Firmenkunde wurde erfolgreich erstellt.");
                this.Close();
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.Message);
            }