You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The
application connects to a Microsoft SQL Server database. The application uses the following object
query to load a product from the database. (Line numbers are included for reference only.)
01 Using advWorksContext As New AdventureWorksEntities()
02 Dim productQuery As ObjectQuery(Of Product) =
03 advWorksContext.Product.Where(“it.ProductID = 900”)
04
05 End Using
You need to log the command that the query executes against the data source. Which code segment
should you insert at line 04?

A.
Trace.WriteLine(productQuery.ToString())

B.
Trace.WriteLine(productQuery.ToTraceString())

C.
Trace.WriteLine(productQuery.CommandText)

D.
Trace.WriteLine((DirectCast(productQuery, IQueryable)).Expression)

Explanation:
CHAPTER 8 Developing Reliable Applications
Lesson 1: Monitoring and Collecting Performance Data
Accessing SQL Generated by the Entity Framework (page 509)