Сделать INSERT/DELETE/UPDATE таблиц

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data.SqlClient;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace newKursApp
{
    public partial class Main : Form
    {
        public Main()
        {
            InitializeComponent();
        }
        
        SqlDataAdapter sqldataadapter;
        DataSet dataset;
        SqlCommandBuilder sqlcommandbuilder;
        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'kursDataSet.Predpriyatie' table. You can move, or remove it, as needed.
            this.predpriyatieTableAdapter.Fill(this.kursDataSet.Predpriyatie);
            // TODO: This line of code loads data into the 'kursDataSet.Brigada' table. You can move, or remove it, as needed.
            this.brigadaTableAdapter.Fill(this.kursDataSet.Brigada);
            // TODO: This line of code loads data into the 'kursDataSet.Uchastok' table. You can move, or remove it, as needed.
            this.uchastokTableAdapter.Fill(this.kursDataSet.Uchastok);
            // TODO: This line of code loads data into the 'kursDataSet.Technics' table. You can move, or remove it, as needed.
            this.technicsTableAdapter.Fill(this.kursDataSet.Technics);
            // TODO: This line of code loads data into the 'kursDataSet.Rabochie' table. You can move, or remove it, as needed.
            this.rabochieTableAdapter.Fill(this.kursDataSet.Rabochie);
            // TODO: This line of code loads data into the 'kursDataSet.InzhTechPersonal' table. You can move, or remove it, as needed.
            this.inzhTechPersonalTableAdapter.Fill(this.kursDataSet.InzhTechPersonal);
            // TODO: This line of code loads data into the 'kursDataSet.Ceh' table. You can move, or remove it, as needed.
            this.cehTableAdapter.Fill(this.kursDataSet.Ceh);
        }
 
        private void btnShowTable_Click(object sender, EventArgs e)
        {
            
            if (comboBox1.SelectedIndex == 0)
            {
                testDG.DataSource = cehBindingSource;
            }
            if (comboBox1.SelectedIndex == 1)
            {
                testDG.DataSource = inzhTechPersonalBindingSource;
            }
            if (comboBox1.SelectedIndex == 2)
            {
                testDG.DataSource = rabochieBindingSource;
            }
            if (comboBox1.SelectedIndex == 3)
            {
                testDG.DataSource = technicsBindingSource;
            }
            if (comboBox1.SelectedIndex == 4)
            {
                testDG.DataSource = uchastokBindingSource;
            }
            if (comboBox1.SelectedIndex == 5)
            {
                testDG.DataSource = brigadaBindingSource;
            }
            if (comboBox1.SelectedIndex == 6)
            {
                testDG.DataSource = predpriyatieBindingSource;
            }            
        }
 
        private void _btnOpenQueryForm_Click(object sender, EventArgs e)
        {
            
        }
 
        private void справкаToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FAQ faq = new FAQ();
            faq.Show();
        }
 
        private void запросыToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Query f = new Query(); // создаем
            f.Show(); // или так
        }
 
        private void _btnUpdate_Click(object sender, EventArgs e)
        {
            /*SqlCommandBuilder sqlcommandbuilder = new SqlCommandBuilder(sqldataadapter);
            sqldataadapter.Update(kursDataSet);*/
        }
    }
}