public DataTable update(String table)
        {
            String mConnectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\User\Desktop\Форович\WindowsFormsApplication1\WindowsFormsApplication1\BankDB1.mdf;Integrated Security=True";
            SqlConnection sqlConnection = new SqlConnection(this.mConnectionString);
            SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT * FROM [" + table + "]", sqlConnection);
            DataTable dataTable = new DataTable();
            dataAdapter.Fill(this.dataTable);
            return dataTable;
            dataGridView1.DataSource = new BindingSource { DataSource = this.Update("НАЗВАНИЕ ТАБЛИЦЫ") };
        }