Scheduling form with multiple items that need to be rented at the same time

Question

I need to make an agenda to register:

• The information on scheduling
• Register multiple instruments at once with scheduling information

The button Buscar cliente pulls the data(Client ID and Name) from a customer registration table, as well as the button buscar instrumento that just pulls the field Codigo instrument of an instrument table.

Under the button buscar instrumentos has a dgv, in that dgv I wanted to put all the instruments that would be rented on a schedule, and then when clicked the button agendar, a record in both dgvs to the side would be made, the dgv SCHEDULING would have all SCHEDULING INFORMATION, and the dgv RENTED INSTRUMENTS would have the ID_Agendamento dgv SCHEDULES and would also have all the fields that are inside the groupbox INSTRUMENTS TO RENT, remembering that the insert button inserts the instruments in the dgv do group box INSTRUMENTS RENT and delete button excludes the inserted instruments because the administrator inserted some wrong instrument.

Form code-----

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using UIWINDOWS.bdtccTableAdapters;

namespace UIWINDOWS
{
    public partial class FrmAgenda3 : Form
    {
        public FrmAgenda3()
        {
            InitializeComponent();
        }



        private void FrmAgenda3_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'etecbd.Alugados' table. You can move, or remove it, as needed.
            this.alugadosTableAdapter2.Fill(this.etecbd.Alugados);
            // TODO: This line of code loads data into the 'etecbd.Agenda' table. You can move, or remove it, as needed.
            this.agendaTableAdapter2.Fill(this.etecbd.Agenda);


        }

        private void button1_Click(object sender, EventArgs e)
        {
            FrmBuscarMusico obj = new FrmBuscarMusico();
            obj.ShowDialog();
            iD_ClIENTETextBox.Text = obj.Codreto.ToString();
            nomeTextBox.Text = obj.Nomeretor.ToString();
            iD_ClIENTETextBox.Focus();


        }

        private void button2_Click(object sender, EventArgs e)
        {
            FrmBuscarInstrumento obj = new FrmBuscarInstrumento();
            obj.ShowDialog();
            codigo_instrumentoTextBox.Text = obj.Codret.ToString();           
            codigo_instrumentoTextBox.Focus();


        }
    }
}