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 /**public void RefreshTable()
        {
            string connectionString = "data source=localhost; initial catalog = owo; persist security info = True; Integrated Security = SSPI; ";
            //comboBox1.SelectedIndex == null ? comboBox1.SelectedIndex := 0 : string selectedTable = comboBox1.SelectedItem.ToString();
            //comboBox1.SelectedIndex = 0; / if (selectedTable) { selectedTable = 0; }

            string selectedTable = comboBox1.SelectedItem.ToString();
            string sql = $"SELECT * FROM [{selectedTable} WHERE id < 0]";
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                // Создаем объект DataAdapter
                SqlDataAdapter adapter = new SqlDataAdapter(sql, connection);
                // Создаем объект Dataset
                DataSet ds = new DataSet();
                // Заполняем Dataset
                adapter.Fill(ds);
                // Отображаем данные
                dataGridView1.DataSource = ds.Tables[0];
            }
        }



        public Add_Form()
        {
            InitializeComponent();
        }

        private void refresh_button_Click(object sender, EventArgs e)
        {
            RefreshTable();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string selectedTable = comboBox1.SelectedItem.ToString();
        }**/

        public Add_Form()
        {
            InitializeComponent();

        }