A Basic C# Skills Test Questions!

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| By Kevin Marzec
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Kevin Marzec
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A Basic C# Skills Test Questions! - Quiz

There are different programming languages in existence, and understanding the most basic, which is C# (C Sharp), can be a little hard for some. The quiz below is designed to help you refresh your memory on what you have covered so far. Give it a shot and see how much you know!


Questions and Answers
  • 1. 

    Does C# support multiple inheritances?

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    C# does not support multiple inheritances. Multiple inheritances refer to the ability of a class to inherit from multiple base classes. In C#, a class can only inherit from a single base class. This is done to avoid the ambiguity and complexity that can arise from multiple inheritance, as it can lead to conflicts when two or more base classes have methods or properties with the same name. To achieve similar functionality, C# supports interfaces, which allow a class to implement multiple interfaces and inherit their methods and properties.

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  • 2. 

    What is the top .NET class that everything is derived from?

    • A.

      Object

    • B.

      System.Net

    • C.

      System.Object

    • D.

      System

    • E.

      System.Root

    Correct Answer
    C. System.Object
    Explanation
    The top .NET class that everything is derived from is System.Object. In .NET, all classes are derived from the Object class, which provides the most basic functionality that all objects share, such as methods for cloning, comparing, and converting objects. This class serves as the root of the class hierarchy in .NET and is implicitly inherited by all other classes.

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  • 3. 

    Which .NET collection class allows elements to be accessed using a unique key?

    • A.

      ListDictionary

    • B.

      Stack

    • C.

      Hashtable

    • D.

      ArrayList

    • E.

      StringCollection

    Correct Answer
    C. Hashtable
    Explanation
    The Hashtable class in .NET allows elements to be accessed using a unique key. It is a collection class that stores key-value pairs, where each key is unique and used to access its corresponding value. This class provides fast lookup and retrieval of elements based on their keys, making it suitable for scenarios where quick access to specific elements is required. Unlike other collection classes like ArrayList or Stack, Hashtable provides efficient key-based access to elements.

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  • 4. 

    Will the finally block get executed if an exception has not occurred?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    The finally block will always get executed, regardless of whether an exception has occurred or not. This block is used to perform any necessary cleanup operations, such as closing files or releasing resources, and it ensures that these operations are executed even if an exception is thrown. Therefore, even if no exception occurs, the finally block will still be executed.

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  • 5. 

    Can multiple catch blocks be executed for a single try statement.

    • A.

      Yes

    • B.

      No

    Correct Answer
    B. No
    Explanation
    Multiple catch blocks cannot be executed for a single try statement. In a try-catch block, only one catch block is executed, depending on the type of exception thrown. Once an exception is caught and handled by a catch block, the program continues its execution after the try-catch block. If multiple catch blocks were allowed to be executed, it would create ambiguity and make the code harder to understand and debug. Therefore, the correct answer is "No".

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  • 6. 

    Does .NET support the ability to inherit multiple interfaces?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    .NET does support the ability to inherit multiple interfaces. This feature is known as multiple interface inheritance and allows a class to inherit from multiple interfaces, enabling it to implement the methods and properties defined in each interface. This feature provides flexibility and allows for better code organization and reusability.

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  • 7. 

    Which of these words are part of the "ACID" rule of thumb for database transactions? Select all that apply.

    • A.

      Isolated

    • B.

      Connected

    • C.

      Durable

    • D.

      Atomic

    • E.

      Integrity

    Correct Answer(s)
    A. Isolated
    C. Durable
    D. Atomic
    Explanation
    The word "Isolated" is part of the "ACID" rule of thumb for database transactions. In the context of databases, ACID stands for Atomicity, Consistency, Isolation, and Durability. Isolation refers to the property that ensures each transaction is executed independently and doesn't interfere with other transactions. It guarantees that concurrent transactions do not affect each other's results. Therefore, "Isolated, Durable and Atomic" are correct answers as they aligns with the ACID principle.

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  • 8. 

    The C# keyword "int" maps to which .NET type? 

    • A.

      System.Int16

    • B.

      System.Int32

    • C.

      System.Int64

    • D.

      System.Int128

    Correct Answer
    B. System.Int32
    Explanation
    The C# keyword "int" maps to the .NET type System.Int32. This is because "int" in C# represents a 32-bit signed integer, and System.Int32 is the corresponding .NET type for this data type.

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  • 9. 

    Which of these statements correctly declares a two-dimensional integer array in C#?

    • A.

      Int[,] myArray;

    • B.

      Int[][] myArray;

    • C.

      Int[2] myArray

    • D.

      System.Array[2] myArray;

    • E.

      System.Array[,] myArray;

    Correct Answer
    A. Int[,] myArray;
    Explanation
    The correct answer is int[,] myArray; because it declares a two-dimensional integer array in C#. The int[,] syntax specifies that the array will have two dimensions, and myArray is the name given to the array variable.

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  • 10. 

    If a method is marked as protected internal, who can access it?

    • A.

      Classes that are both in the same assembly and derived from the declaring class.

    • B.

      Only methods that are in the same class as the method in question.

    • C.

      Internal methods can only be called using reflection.

    • D.

      Classes within the same assembly, and classes derived from the declaring class.

    Correct Answer
    D. Classes within the same assembly, and classes derived from the declaring class.
    Explanation
    A method marked as protected internal can be accessed by classes within the same assembly and classes derived from the declaring class. This means that any class within the same assembly can access the method, regardless of whether it is derived from the declaring class or not. Additionally, any class that is derived from the declaring class, regardless of whether it is in the same assembly or not, can also access the method.

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  • 11. 

    What is boxing?

    • A.

      Encapsulating an object in a value type.

    • B.

      Encapsulating a copy of a value type in an object.

    • C.

      Encapsulating a copy of an object in a value type.

    • D.

      Encapsulating a value type in an object.

    Correct Answer
    B. Encapsulating a copy of a value type in an object.
    Explanation
    Boxing is the process of encapsulating a copy of a value type in an object. When a value type is boxed, it is converted to an object type and stored on the heap instead of the stack. This allows the value type to be treated as an object and enables it to be used in scenarios that require reference types, such as being stored in a collection or passed as a parameter to a method that expects an object. Boxing creates a new object on the heap and copies the value type's value into it, ensuring that any modifications to the boxed object do not affect the original value type.

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  • 12. 

    Which compiler switch creates an xml file from the xml comments in the files in an assembly?

    • A.

      /text

    • B.

      /doc

    • C.

      /xml

    • D.

      /help

    • E.

      /xmlhelp

    Correct Answer
    B. /doc
    Explanation
    The correct answer is /doc. This compiler switch is used to create an XML file from the XML comments in the files in an assembly. These XML comments are special comments that are used to document the code, providing information about the purpose and functionality of the code elements. By using the /doc switch, the compiler generates an XML file that contains this documentation, which can then be used by tools such as IntelliSense or documentation generators to provide information to developers using the assembly.

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  • 13. 

    Which common design pattern is shown below? public class A  {     private A instance;     private A() { }     public static A Instance      {       get       {         if(instance == null)           instance = new A();         return instance;       }     } }

    • A.

      Factory

    • B.

      Abstract Factory

    • C.

      Singleton

    • D.

      Builder

    Correct Answer
    C. Singleton
    Explanation
    The given code snippet demonstrates the Singleton design pattern. In this pattern, a class has a private constructor and a static method that returns the same instance of the class every time it is called. The private variable "instance" is used to store the single instance of the class, and the static method "Instance" checks if the instance is null and creates a new instance if it is. This ensures that only one instance of the class is created and accessed throughout the application.

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  • 14. 

    Which of the following operations can you NOT perform on an ADO.NET DataSet?

    • A.

      A DataSet can be synchronized with the database.

    • B.

      A DataSet can be synchronized with a RecordSet.

    • C.

      A DataSet can be converted to XML.

    • D.

      You can infer the schema from a DataSet.

    Correct Answer
    B. A DataSet can be synchronized with a RecordSet.
    Explanation
    ADO.NET DataSet cannot be synchronized with a RecordSet. A RecordSet is a data structure in ADO (ActiveX Data Objects) technology, which is used to represent a set of records from a database table. ADO.NET DataSet, on the other hand, is a disconnected, in-memory representation of data that can be retrieved from a database using ADO.NET technology. While a DataSet can be synchronized with a database and can be converted to XML, it cannot be synchronized with a RecordSet as RecordSet is specific to ADO technology.

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  • 15. 

    In Object Oriented Programming, which answers best describes encapsulation?

    • A.

      The conversion of one type of object to another.

    • B.

      The runtime resolution of method calls.

    • C.

      The exposition of data.

    • D.

      The separation of interface and implementation.

    Correct Answer
    D. The separation of interface and implementation.
    Explanation
    Encapsulation in object-oriented programming refers to the practice of hiding the internal details of an object and exposing only the necessary information through a well-defined interface. This allows for better control over the object's behavior and prevents direct access to its internal data. The separation of interface and implementation is the best description of encapsulation as it emphasizes the importance of hiding the implementation details while providing a clear and defined interface for interacting with the object.

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  • 16. 

    Can you change the value of a variable while debugging a C# application?

    • A.

      Yes

    • B.

      No

    Correct Answer
    A. Yes
    Explanation
    Yes, you can change the value of a variable while debugging a C# application. Debugging allows you to pause the execution of the program at a specific point and inspect the values of variables. You can modify the value of a variable during debugging to test different scenarios and analyze the behavior of the program. This can be done by simply editing the value in the debugger's interface.

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  • Current Version
  • Feb 01, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 01, 2009
    Quiz Created by
    Kevin Marzec
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