aero03/Form1.cs

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 System.Data.SqlClient;

namespace Lab1_{


    public partial class Form1 : Form
    {
        SqlConnection connection;
        SqlCommand command;
        SqlDataAdapter adapter;
        DataTable table;

        public Form1()
        {

            InitializeComponent();
            dataGridView1.AutoGenerateColumns = true;
            // УКАЖИТЕ СВОЙ АДРЕС СЕРВЕРА ИЗ СРЕДЫ SSMS!
            connection = new SqlConnection("Server=DESKTOP‐PD8FNND\\SQLEXPRESS;Database=aero03;Trusted_Connection=True;");
            command = new SqlCommand();
            command.Connection = connection;
            command.CommandType = CommandType.Text;
            adapter = new SqlDataAdapter(command);
            table = new DataTable();
            dataGridView1.DataSource = table;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: данная строка кода позволяет загрузить данные в таблицу "aero03DataSet.Trip". При необходимости она может быть перемещена или удалена.
            this.tripTableAdapter.Fill(this.aero03DataSet.Trip);
        }
            private void ShowTable(string text)
            {
                dataGridView1.Columns.Clear();
                dataGridView1.DataSource = null;
                command.CommandText = text;
                table.Clear();
                adapter.Fill(table);
                dataGridView1.DataSource = table;

            }
        

        private void button1_Click(object sender, EventArgs e)
        {
          ShowTable("SELECT * FROM Company");
        }

        private void button2_Click(object sender, EventArgs e)
        {
                connection.Open();
                command.CommandText = "INSERT INTO Company VALUES (\'" + name.Text + "\');";
                command.ExecuteReader();
                connection.Close();
                ShowTable("SELECT * FROM Company");
        }

        private void button3_Click(object sender, EventArgs e)
        {
                connection.Open();
                command.CommandText = "DELETE FROM Company WHERE ID_comp>= 6";
                command.ExecuteReader();
                connection.Close();
                ShowTable("SELECT * FROM Company");
        }
    }
}