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C# code:
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=orders.mdb;User Id=admin;Jet OLEDB:Database Password=hhh");
conn.Open();
string str = "select p.name, o.number,o.ordersday,o.giveday, p.id,p.name,p.how,p.price from [particular] as p join [orders] as o on p.id = o.id where o.ordersday='" + dateTimePicker1.Text + "' and o.giveday='" + dateTimePicker2.Text + "' and name='" + comboBox1.Text + "'";
OleDbCommand cmd = new OleDbCommand(str, conn);
[color=#FF0000] OleDbDataReader sdr2 = cmd.ExecuteReader();[/color]


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