private void btnDynamicQuery_Click(object sender, EventArgs e)
{
btnAdd.Enabled = false;
btnDelete.Enabled = false;
btnSave.Enabled = false;
EmployeesQuery eq = new EmployeesQuery("eq");
OrdersQuery oq = new OrdersQuery("oq");
eq.Select(eq.EmployeeID, eq.LastName, eq.FirstName, oq.OrderID, oq.ShipCity);
eq.InnerJoin(oq).On(eq.EmployeeID == oq.EmployeeID);
coll = new EmployeesCollection();
coll.Load(eq);
_bindingSource.DataSource = coll;
}