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•  Adapter
•  Bridge
•  Singleton
•  Builder

•  CoreCLR is a component that allows the highest degree of control when coding; you can Abort(), Suspend(), or Resume().
•  CoreCLR is the .NET execution engine that runs the source code. Special programs called compilers must rewrite it into MSIL.
•  CoreCLR is the .NET execution engine the runs the source code. Special programs called compilers must rewrite it into IL.
•  CoreCLR is the .NET execution engine in .NET Core that performs functions like garbage collection and compilation to machine code.

•  Queues process value types by a top-down hierarchy – first in, first out (FIFO). Stacks follow this principle and insert items from the lower end while deleting ones from the top – last in, first-out (LIFO).
•  Queues process value types by a top-down hierarchy-last in, first-out (LIFO). Stacks follow this principle and insert items from the lower end while deleting ones from the top-first in, first-out (FIFO).
•  Stacks process value types by a top-down hierarchy – last in, first-out (LIFO). Queues follow this principle and insert items from the lower end while deleting ones from the top – first in, first-out (FIFO)
•  Stacks process value types by a top-down hierarchy-first in, first out (FIFO). Queues follow this principle and insert items from the lower end while deleting ones from the top-last in, first-out (LIFO).

•  Pre-JIT, Quick-JIT, Coll-JIT
•  Before-JIT, Quick-JIT, Cool-JIT
•  Pre-JIT, Quick-JIT, Normal-JIT
•  Pre-JIT, Econo-JIT, Normal-JIT

•  an iOS web server initially that was later designed to work with .NET Core
•  a cross-platform web server ASP.NET Core that is included by default in ASP.NET Core project templates** <= Correct
•  a cross-platform, open-source web server that starts up web APIs
•  a free and open-source cross-platform web server software that can communicate with IIS

•  You cannot concatenate strings in .NET.
•  The second string object is modified so it contains the concatenated strings.
•  A third string object is created containing the concatenated strings.
•  The first string object is modified so it contains the concatenated strings.

•  to release the quest thread of a I/O operation
•  to capture the request thread of a I/O operation
•  to avoid blocking the request thread while waits for an I/O operation
•  to block the request thread if it waits for an I/O operation

•  Abstract methods cannot be used in derived classes.
•  In your derived class, overload the method.
•  In your derived class, override the method.
•  In your derived class, declare the method as virtual.

•  Garbage.CleanUp();
•  System.GC.Clear();
•  System.GC.Collect();
•  Garbage.Collect();

•  Interpreter
•  Command
•  Bridge
•  Decorator

•  an assembly with the version specified
•  a signed assembly
•  an assembly with cultural information
•  an assembly with the name marked as important

•  XML
•  C#
•  LINQ
•  XAML

•  An abstract class provides a partial implementation for functionality and some abstract or virtual members that must be implemented by the inheriting entities. It can declare fields too.
•  An abstract class allows developers to create new classes that reuse, extend, and modify the behavior defined in other classes.
•  An abstract class is responsible for keeping track of what is actually executing and where each executing thread is.
•  An abstract class declares a contract or behavior that implementing classes require. It may declare only properties, methods, and events with no access modifiers. All the declared members must be implemented.

•  when you want to increase the .NET API surface area your library can access, and allow only .NET Core apps to be compatible with your library
•  when you want to increase the number of apps that are compatible with your library, and decrease the .NET API surface area your library can access
•  when you want to decrease speed but have more features
•  when you want to increase compilation speed and have fewer features

•  The SDK is the “virtual machine” that hosts and runs the application and abstracts all the interaction with the operating system; the runtime usually includes documentation and other help files.
•  The runtime is the virtual machine that hosts and runs the application and abstracts all the interaction with the operating system; the SDK usually includes documentation and other help files.
•  The runtime compiles code along with the CLR; the SDK usually includes documentation and other help files.
•  The SDK compiles code along with the CLR; the runtime usually includes documentation and other help files.

•  y = (int)thisObject;
•  int y = 3;
•  y = (int)thisObject=;3;
•  object thisObject = y;

•  System.Data.Caching;
•  All.System.Caching;
•  System.Runtime.Caching;
•  System.Compiler.Caching;

•  An interface provides a partial implementation for functionality and some abstract or virtual members that must be implemented by the inheriting entities. It can declare fields too.
•  An interface is responsible for keeping track of what is actually executing and where each executing thread is.
•  An interface allows developers to create new classes that reuse, extend, and modify the behavior defined in other classes.
•  An interface declares a contract or behavior that implementing classes require. It may declare only properties, methods, and events with no access modifiers. All the declared members must be implemented.

•  CAS stands for Code Application Secrets and it enables users to restrict, on a very granular level, what hidden code can do according to a level of trust for an application.
•  CAS stands for Code Access Secrets and it enables users to restrict, on a very granular level, what hidden code can do according to a level of trust.
•  CAS stands for Cognitive Access Security and it enables users to restrict security logic manipulation.
•  CAS stands for Code Access Security and it enables users to restrict, on a very granular level, what managed code can do according to a level of trust.

•  A statement lambda cannot return a value. <= Correct
•  If a statement lambda has a return value, it has to use a return statement.
•  A statement lambda requires using curly braces.
•  A statement lambda can have more than one statement.

•  At runtime, its value is evaluated.
•  It can be either static or an instance member.
•  It can be initialized at declaration only.
•  It can be initialized in either the constructor or the declaration.

•  string is used for fied-size strings in C#, while System.String is used for all the strings.
•  There is no such class as System.String.
•  There is none—string is an alias for System. String.
•  System.String is a VB.NET data type, while string is a C# type.

•  It breaks from only the outer loop.
•  It breaks from all loops.
•  It breaks from only the inner loop.
•  It breaks from the outer loop after the second iteration.

•  Adapter
•  Bridge
•  Singleton
•  Builder

•  Command
•  Iterator
•  Facade
•  Observer

•  to compile only the methods that are called at runtime and store those methods in cache after execution
•  to compile complete source code into native code in a single compilation cycle during deployment of the application
•  to compile only the methods that are called at runtime and then store them in cache for one minute
•  to compile only the methods that are called at runtime and remove them from memory after execution

•  Code contracts are data structures that can operate on demand per requirements.
•  Code contracts provide a way to specify preconditions, postconditions, and object invariants in your code.
•  Code contracts contain definitions for a group of related functionalities that a class or a struct can implement.
•  Code contracts contain data structures for a group of related functionalities that a class or a struct can implement.

•  Construct an HTTP request URI and an HTTPS request URI.
•  Invoke the GetCurrentApplicationCallbackUri method and construct an HTTPS request URI.
•  Invoke the AuthenticateAsync and GetCurrentApplicationCallbackUri methods.
•  Invoke the AuthenticateAsync method and construct an HTTPS request URI. //The requestUri parameter must be a HTTPS address and // You call the AuthenticateAsync method to // connect to the online identity provider and get an access token

•  Adapter
•  Singleton
•  Bridge
•  Decorator

•  Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
•  A class should have only a single responsibility—that is, only changes to one part of the software’s specification should be able to affect the specification of the class.
•  Software entities should be open for extension but closed for modification.
•  Entities must depend on abstractions, not on concrete implementations. <= Correct

•  a group of generic collections—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications
•  a group of methods—in a logical hierarchy by class—that enable you to access the core functionality you need in .NET
•  a group of assemblies—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications
•  a group of classes, structures, interfaces, enumerations, and delegates—organized in a logical hierarchy by function that enable you to access the core functionality you need in your applications

•  select new { a.Country, a.Region }
•  select a
•  select a.Country, a.Region
•  select { a.Country, a.Region }

•  At compile time, the value is evaluated.
•  Only at declaration can it be initialized.
•  At runtime, its value is evaluated.
•  It cannot be static.

•  CLR performs various operations such as security checks, spell checks, assembly loading, and thread management. It provides a secure execution environment for the internet.
•  CLR sets the rules developers must use for the components that are interlanguage compatible. CLR is reusable across all the .NET-compliant languages.
•  CLR is a compiler that converts Intermediate Language to a native code.
•  CLR performs various operations such as memory management, security checks, assembly loading, and thread management. It also provides a secure execution environment for applications.

•  Formerly known as MSIL, CIL is a programming language that NET developers use. It represents the lowest possible level for a language that humans can still read.
•  CIL is an object-oriented programming language that is a partially compiled code that .NET developers will then compile to native machine code.
•  CIL is used to convert a value type to an object type.
•  CIL is a compiled code library that Microsoft developed as an open specification. Developers use it for security, versioning, and deployment purposes.