Untitled

Multiple WHERE Clauses with LINQ extension methods
DateTime today = DateTime.UtcNow;
var results = from order in context.Orders
              where ((order.OrderDate <= today) && (today <= order.OrderDate))
              select order;

if (useAdditionalClauses)
{
  results = results.Where(o => o.OrderStatus == OrderStatus.Open)  // Now I'm stuck.
}

results = results.Where(o => (o.OrderStatus == OrderStatus.Open) &&
                             (o.CustomerID == customerID));

results = results.Where(o => (o.OrderStatus == OrderStatus.Open))
                 .Where(o => (o.CustomerID == customerID));

results = results.Where (o => o.OrderStatus == OrderStatus.Open);
results = results.Where (o => o.InvoicePaid);

if (useAdditionalClauses)
{
  results = results.Where(o => o.OrderStatus == OrderStatus.Open && o.CustomerID == customerID)  // Now I'm stuck.
}

if (useAdditionalClauses)
{
  results =
    results.Where(o => o.OrderStatus == OrderStatus.Open &&
    o.CustomerID == customerID)
}

if (useAdditionalClauses)
{
  results = results.Where(o => o.OrderStatus == OrderStatus.Open).
    Where(o => o.CustomerID == customerID);
}

results = context.Orders.Where(o => o.OrderDate <= today && today <= o.OrderDate)