Write the basic syntax of a LINQ query in Visual Basic as well as in C#.

Correct Answer: LINQ is a programming model that is the composition of general-purpose standard query operators that allow you to work with data, regardless of the data source in any NET based programming language It is the name given to a set of technologies based on the integration of query capabilities into any NET language

Correct Answer: Variables that are defined in a C# program belong to two major categories: value type and reference type The variables that are based on value type contain a value that is either allocated on a stack or allocated in-line in a structure The variables that are based on reference types store the memory address of a variable, which in turn stores the value and are allocated on the heap The variables that are based on value types have their own copy of data and therefore operations done on one variable do not affect other variables The reference-type variables reflect the changes made in the referring variables

Correct Answer: You can deploy an ASPNET Web application using either the Windows Installer deployment or ClickOnce deployment technique

Correct Answer: => Windows Installer => ClickOnce => XCOPY => Copy Web Site => Publish Web Site tool

Correct Answer: Workflows serve the purpose of automating business processes Now, since each type of business has a wide range of problems; therefore, a workflow platform needs to be extensible WF provides you with a set of base activities, such as IfElse, Code, and Delay, to build a workflow You can extend these activities or build new activities to meet your requirements Besides activities, you can also extend services, such as tracking, management, and persistence, provided by the runtime engine

Correct Answer: After you add a LINQ to SQL Classes item to a project and open the O/R Designer, the empty design surface represents an empty DataContext class ready to be configured The DataContext class is a LINQ to SQL class that acts as a conduit between a SQL Server database and the LINQ to SQL entity classes mapped to that database This class contains the connection string information and the methods for connecting to a database and manipulating the data in the database It is configured with connection information provided by the first item that is dragged onto the design surface

Correct Answer: The standard query operators in LINQ are the extension methods that form the LINQ pattern These operators form an API that enables querying of any NET array or collection It operates on sequences and allows you to perform operations, such as determining if a value exists in the sequence and performing an aggregated function, such as a summation over a sequence

Correct Answer: The standard query operators implement the IEnumerable or the IQueryable interface in C# and the IEnumerable(Of T) or the IQueryable(Of T) interface in Visual Basic

Correct Answer: Windows services, previously known as NT services, are applications that are installed on the system as system services In other words, Windows services are applications that run in the background with the Windows operating system The primary use of Windows services is to reduce the consumption of memory required for performing backend operations Let's take an example to understand this easily Suppose you want to perform a variety of functions, such as monitor the performance of your computer or application, check the status of an application, and manage various devices, such as printers In such a case, you can use Windows services to reduce memory consumption In addition, Windows services can run on your system even if you have not logged on to your computer In addition, these services do not have any user interface

Correct Answer: The ServiceInstaller class, also known as the project installer class, is used to install a Windows service