newRepa/FormAddRecord.cs

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

namespace InfoTrack
{
    public partial class FormAddRecord : Form
    {

        DataBase dataBase = new DataBase();

        public FormAddRecord()
        {
            InitializeComponent();


            panelAddAlbum.Visible = false;
            panelAddGroup.Visible = false;
            panelAddTrack.Visible = false;
            panelAddMusician.Visible = false;


            switch(GlobalValues.nameOfOpenedTable)
            {

                case "Albums":
                    panelAddAlbum.Visible = true;
                    break;

                case "Groups":
                    panelAddGroup.Visible = true;
                    break;
                case "Tracks":
                    panelAddTrack.Visible = true;
                    break;
                case "Musicians":
                    panelAddMusician.Visible = true;
                    break;
            }

        }


        private void buttonAdd_Click(object sender, EventArgs e)
        {
            int index = GlobalValues.lastIndex;
            index++;
            
            dataBase.openConnection();

            switch(GlobalValues.nameOfOpenedTable)
            {
                case "Albums":

                    var NameAlbum = textBoxAddNameAlbum.Text;
                    var CodeGroup = textBoxAddCodeGroup.Text;
                    var DurAlbum = textBoxAddDurAlbum.Text;
                    var Year = textBoxAddYear.Text;
                    var TracksCount = textBoxAddTracksCount.Text;

                    var addQuery = $"insert into Albums (Kod_Album, NameAlbum, Kod_Group, DurationAlbum, YearAlbum, TracksNumbers) values('{index}','{NameAlbum}','{CodeGroup}','{DurAlbum}','{Year}','{TracksCount}')";
                  
                    var command = new SqlCommand(addQuery, dataBase.getConnection());
                    command.ExecuteNonQuery();

                    break;

                case "Groups":

                    var NameGroup = textBoxAddNameGroup.Text;
                    var YearCreation = textBoxAddYearCreation.Text;
                    var DescriptionGroup = textBoxAddDiscription.Text;
                    var Direction = textBoxAddDirection.Text;

                    var addQuery2 = $"insert into Groups (Kod_Group, NameGroup, YearCreation, DescriptionGroup, Direction) values('{index}','{NameGroup}','{YearCreation}','{DescriptionGroup}','{Direction}')";

                    var command2 = new SqlCommand(addQuery2, dataBase.getConnection());
                    command2.ExecuteNonQuery();

                    break;
                case "Tracks":

                    var NameTrack = textBoxAddTrackName.Text;
                    var Kod_Album = textBoxAddCodeAlbum_t.Text;
                    var Kod_Group = textBoxAddCodeGroup_t.Text;
                    var TrackDurationTrack = textBoxAddTimeTrack.Text;

                    var addQuery3 = $"insert into Tracks (Kod_Track, NameTrack, Kod_Album, Kod_Group, TrackDurationTrack) values('{index}','{NameTrack}','{Kod_Album}','{Kod_Group}','{TrackDurationTrack}')";

                    var command3 = new SqlCommand(addQuery3, dataBase.getConnection());
                    command3.ExecuteNonQuery();

                    break;
                case "Musicians":

                    var Kod_Group_m = textBoxAddCodeGroup_m.Text;
                    var NameMusician = textBoxAddNameMus.Text;
                    var Role = textBoxAddRole.Text;
                    var Birthday = textBoxAddbday.Text;

                    var addQuery4 = $"insert into Musicians (Kod_Musician, Kod_Group, NameMusician, Role, Birthday) values('{index}','{Kod_Group_m}','{NameMusician}','{Role}','{Birthday}')";

                    var command4 = new SqlCommand(addQuery4, dataBase.getConnection());
                    command4.ExecuteNonQuery();

                    break;
            }
           
            dataBase.closeConnection();

            MessageBox.Show("Запись успешно добавлена!");
        }

        private void buttonBack_Click(object sender, EventArgs e)
        {
            this.Hide();
            FormMenu form = new FormMenu();
            form.Show();
        }
    }
}