zxcnut_3/Form1.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 Bronin_3
{
    public partial class Form1 : Form
    {
        //string conn = @"Data Source=ZXCNUT\\SQLEXPRESS;Initial Catalog=user03;Integrated Security=True;Encrypt=False";
        // Временно измените строку подключения для проверки
        string conn = @"Data Source=ZXCNUT\SQLEXPRESS;Initial Catalog=user03;Integrated Security=True;";
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            AboutBox1 aboutBox1 = new AboutBox1();
            aboutBox1.ShowDialog(); // О программе

        }

        private void button3_Click(object sender, EventArgs e)
        {
            label1.Text = "nsdf";
            string query = @"SELECT * FROM [dbo].[EdenicaIzmereniya$]";
            using (SqlConnection connect = new SqlConnection(conn))
            {
                try
                {
                    SqlDataAdapter ad = new SqlDataAdapter(query, connect);
                    DataTable f = new DataTable();
                    ad.Fill(f);
                    dataGridView1.DataSource = f;

                }
                catch (Exception ex)
                {
                    MessageBox.Show("Ошибка: " + ex.Message);
                }
            }
        }
    }
}