public void viewitem(DataGridView v)
        {
            connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\oop data base for oil.accdb;
Persist Security Info=False;";
            try
            {
                connection.Open();
                OleDbCommand command = new OleDbCommand();

                command.Connection = connection;

                command.CommandText = "select * from oilstock";
                OleDbDataAdapter da = new OleDbDataAdapter(command);
                DataTable        dt = new DataTable();
                da.Fill(dt);
                viewitems vi = new viewitems();
                vi.Activate();
                v.DataSource = dt;
                connection.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("error" + ex);
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            viewitems vi = new viewitems();

            vi.Show();
            //  da.Fill(dt);

            //  itemsview.
            Hide();
        }