' Specify the customer ID.
Dim customerId As Integer = 4332

Using context As New AdventureWorksEntities
    Try
        ' Get a specified customer by contact ID.
        Dim customer As Contact = context.Contact _
            .Where("it.ContactID = @customerId", _
            New ObjectParameter("customerId", customerId)).First()

        ' Load the orders for the customer
        If (Not customer.SalesOrderHeader.IsLoaded) Then
            customer.SalesOrderHeader.Load()
        End If

        For Each order As SalesOrderHeader In customer.SalesOrderHeader

            ' Load the items for the order if not already loaded.
            If Not order.SalesOrderDetail.IsLoaded Then
                order.SalesOrderDetail.Load()
            End If


            Console.WriteLine(String.Format("PO Number: {0}", _
                    order.PurchaseOrderNumber))
            Console.WriteLine(String.Format("Order Date: {0}", _
                    order.OrderDate.ToString()))
            Console.WriteLine("Order items:")
            Dim item As SalesOrderDetail
            For Each item In order.SalesOrderDetail
                Console.WriteLine(String.Format("Product:{0}" _
                    + "Quantity: {1}", item.ProductID.ToString(), _
                    item.OrderQty.ToString()))
            Next
        Next
    Catch ex As EntitySqlException
        Console.WriteLine(ex.ToString())
    Catch ex As EntityCommandExecutionException
        Console.WriteLine(ex.ToString())
    End Try
End Using

// Specify the customer ID.
int customerId = 4332;

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    try
    {
        // Get a specified customer by contact ID.
        Contact customer = context.Contact
            .Where("it.ContactID = @customerId", 
            new ObjectParameter("customerId", customerId)).First();

        // Load the orders for the customer
        if (!customer.SalesOrderHeader.IsLoaded)
        {
            customer.SalesOrderHeader.Load();
        }

        foreach (SalesOrderHeader order in customer.SalesOrderHeader)
        {
            // Load the items for the order if not already loaded.
            if (!order.SalesOrderDetail.IsLoaded)
            {
                order.SalesOrderDetail.Load();
            }

            Console.WriteLine(String.Format("PO Number: {0}",
                order.PurchaseOrderNumber));
            Console.WriteLine(String.Format("Order Date: {0}",
                order.OrderDate.ToString()));
            Console.WriteLine("Order items:");
            foreach (SalesOrderDetail item in order.SalesOrderDetail)
            {
                Console.WriteLine(String.Format("Product: {0} "
                    + "Quantity: {1}", item.ProductID.ToString(),
                    item.OrderQty.ToString()));
            }
        }
    }
    catch (EntitySqlException ex)
    {
        Console.WriteLine(ex.ToString());
    }
    catch (EntityCommandExecutionException ex)
    {
        Console.WriteLine(ex.ToString());
    }
}