Software Techniques

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Mastering C# and Windows Forms Quiz

Test your knowledge of C# and Windows Forms with our comprehensive quiz designed for developers of all levels. Challenge yourself with questions that cover essential concepts in software development, threading, and UI design.

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C# Basics
Windows Forms Architecture
Threading and Synchronization
Event Handling

83 Questions21 MinutesCreated by CodingWizard101

When building C# code, the first step is to compile it to an intermediate language representation (MSIL). This requires further compilation before it can be executed.

True

False

In Windows Forms, Controls can be organized into a parent/child, as well as an Owner/Owned relationship.

True

False

N Windows Forms, Forms can be organized into a parent/child, as well as an Owner/Owned relationship.

True

False

In Windows Forms, Controls can be organized into parent/child, while Forms can be organized into owner/owned relationships.

True

False

We want a Windows Forms Form to redraw itself. Instead of calling OnPaint, we must call … method so that the redrawing is scheduled by the OS?

In C#, delegate objects are the modern equivalent to C function pointers. However, unlike in C, they can reference/point to multiple functions.

True

False

What class should we use in .NET, if we have a thread that wants to signal several other threads that it has finished reading data from a file. All of the waiting threads should respond to the signal.

In a Windows Forms application, we want to create a complex (made up of multiple controls) reusable control. What is the best way to achieve this?

In .NET, the Semaphore has the advantage compared to the Mutex that it can be used to synchronize threads of different processes, whereas the Mutex can only be used inside a single process.

True

False

In Win32 applications, messages always go into the target window’s message queue before being handled.

True

False

In Java, we use the “@AttributeName”syntax, in C# the “[AttributeName]” syntax to declaratively add annotations to classes.

True

False

In Win32 applications, every window has a message loop that retrieves and dispatches messages from its queue.

True

False

We are writing a .NET server application that must serve a large number of clients at any given time. Provide the .NET class/concept that is most suitable for providing efficient parallel access to the clients. 1-2 words

A process will exit when there are no more running foreground threads. Background threads are ignored from this perspective.

True

False

A process will exit when there are no more running background threads. Foreground threads are ignored from this perspective.

True

False

Whenever an invalid area is created in our Windows Forms application (for example by another window being dragged off of it) ,we must call invalidate to redraw the area

True

False

Just like Java .class files, each .NET assemblies contains the IL code representation of a single class

True

False

Unlike Java .class files, each .NET assemblies may contain the IL code representation of multiple classes.

True

False

Applications compiled for the full .NET Framework cannot be run on Linux without using Wine or other emulation tools.

True

False

We place a Panel on a Windows Forms Form in such a way that the Panel and the Form’s edges have some space between them. What is the easiest way to achieve the effect, where if the Form’s height is changed, the Panel’s height also changes by the same amount?

When building c# code, the first step is to compile it to native machine languages instructions.

True

False

In .Net we use a lock instruction with the same object parameter inside both functions foo() and bar(). We also know that foo() calls bar(). In other words, we have a case of recursive locking. Evaluate the statement: when foo() is called from any thread, it will cause a deadlock.

True

False

N .Net, we want to retrieve from a worker thread the content of the textbox’s text property (this was instantiated in the main thread). What mechanism/method must we use?

In win32, messages go to system-level queue, before being dispatched to an application queue

True

False

The basic scenario we refer to as DLL Hell : a new application is installed, which overwrites a DLL used by another application. This can happen because the file name of the two DLLs is the same.

True

False

In .NET, the semaphore has the advantage compared to the Mutex that it can be used synchronize threads of different processes, whereas the Mutex cannot.

True

False

What class should we use in .Net, if we have a thread that wants to signal another thread that it has finished reading data from a file. Only one thread should respond to the signal.

In win32 applications we use a switch-case structure in the message loop to react to events.

True

False

-- In a .NET application we ‘circumvent’ .NET and write a class that uses the native Win32 API to reserve resources (e.g. Open files). We write a dispose method for this class, since this allows the resources to be freed as soon as they are not needed

True

False

The JIT compiler takes C# code and compiles it to the native machine language instructions.

True

False

The win32 message created for a keyboard button press contains the code of the button that was pressed in the HWND hwnd field.

True

False

In a ‘connectionless’ data access model, we do not create a database connection when saving data back to the database.

True

False

In a connectionless data access model, we only connect to the database once, when we save the user’s changes

True

False

In a connectionless data access model, we have to keep a record of user’s changes in memory, despite the model’s central idea being that changes are saved to the database as soon as they are made

True

False

In c# when we call a delegate object, all functions registered to the delegate will be called in order

True

False

In Win32 message created for a keyboard button press contains the code of the button that was pressed.

True

False

The processing of Windows events for an application happens in parallel inside an application

True

False

In windows form modal dialog window can signal whether the user closed them using OK or Cancel buttons by setting DialogResult.

True

False

Private .Net assemblies are more secure, because they are signed with the publisher’s secret key

True

False

A win32 CALLBACK function is a special function type implemented by the OS that we call from our application

True

False

In a Win32 environment, every window has a CALLBACK function to handle the window’s messages.

True

False

In Win32 application, we typically use a switch-case structure in the window procedure to react to events.

True

False

Most modern operating systems use non preemptive thread scheduling to avoid starving threads of CPU time.

True

False

In a C# class, we store a large Array or List of strings. We must write a destructor and a Dispose function to make sure that our Array or List is freed.

True

False

In a C# class, we store a large Array initializing it in the constructor. We must write a destructor and a Dispose function to make sure that the Array is freed.

True

False

When building C# code, the first step is to compile it to MSIL. This requires further compilation before it can be executed

True

False

If a class is thread-safe, it can be used from multiple threads without any further synchronization.

True

False

In .NET, a process waits for all of its foreground and background threads to finish running before it exits.

True

False

Win32 API functions can be called from multiple programming environments, including those provided by .NET

True

False

In .NET, we need a locking solution that allows N parallel accesses and works between processes. What mechanism/class would you use?

When using the C# lock statement, we must place it inside a using block (or alternatively, call CloseI() explicitly in a finalize block)

True

False

In Windows Forms, to separate code that was hand-written from auto-generated code, we use ……. Classes.

Installing private .NET assemblies is simple. You just have to copy them onto the machine (i.e you don’t need to register them with the OS)

True

False

We are writing a multi-threaded .NET application in which one thread tries to acquire locks first on object X, then on object Y. A second thread tries to acquire locks first on object Y, then object X. What kind of danger does this pose (one word)?

From the three studied techniques to create custom controls, all the three create controls which can be drag-and-dropped from the visual studio Toolbox

True

False

From the three studied techniques to create custom controls, only solutions that involve classes derived from UserControl class can be drag-and-dropped from the visual studio Toolbox. F

True

False

. In .NET if the internals of a class defined in a DLL change (e.g. We add a private member variable) while its interface stays the same, then we must recompile both the DLL and the components that use the DLL.

True

False

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