Question 1

What is C#?

Accepted Answer

C# is an object-oriented programming language that runs on the .Net framework.  It was developed by Anders Hejlsberg, Peter Golde, and Scott Wiltamuh in the late 1990s but was officially launched in 2000. Enterprises and tech giant companies use C# for the development of scalable business applications and robust performance.

Question 2

What is C# used for?

Accepted Answer

C# is used to create a wide variety of applications and software from mobile apps, desktop apps, and backend of web applications to data science projects. For instance, a few popular games created using C# include Hearthstone, Osirs New Dawn, and Cuphead. C# and Xamarin are used together to create a mobile app smoothly on Android and iOS. C# and ASP.Net are commonly used for powerful backend development of websites and web applications.

Question 3

Explain the difference between static, public, and void.

Accepted Answer

These are keywords that form a part of the main method of a C# program. The main method is the entry point for all C# programs. It tells us what happens to a class when it is executed.   
Public: It is the access specifier that indicates that a method can be accessed publicly.  
Static: This keyword indicates that the object is not required to access static members.  
Void − This indicates that the method doesn’t return any value.

Question 4

What are the four steps involved in the C# code compilation?

Accepted Answer

Compiling source code in managed code.  
 Combining the newly managed module into the assembly/assemblies  
 Loading the CLR  
 Assembly execution through CLR

Question 5

What is garbage collection in C#?

Accepted Answer

Garbage collection is a memory feature built into programming languages like Java and C#. In C#, garbage collectors manage memory by automatically freeing up the space that is no longer being used by the application.

Question 6

Give an example of LINQ in C#.

Accepted Answer

Language Integrated Query (LINQ) is a technology based on the integration of query capabilities directly into the C# language. Here is an example of a complete query operation. You might need to add a using directive, using System.Linq;, for the preceding example to compile.

// Specify the data source.

int[] scores = [97, 92, 81, 60];

// Define the query expression. 
IEnumerable  scoreQuery = 
    from score in scores 
    where score > 80 
    select score; 
// Execute the query. 
foreach (var i in scoreQuery) 
{ 
    Console.Write(i + " "); 
}

// Output: 97 92 81

Question 7

Mention the important IDEs for C# development.

Accepted Answer

An IDE, or integrated development environment, is a program that supports many aspects of software development. Here are the top free C# IDEs and Compilers (Editor)

VS Code   
 
 SlickEdit

Dreamweaver

Eclipse aCute

NotePad++

Rider

DevExpress

Codeanywhere

Scriptcs

Question 8

What's the difference between directcast and ctype?

Accepted Answer

For an object that needs run-time similar to a different object, DirectCast is used for conversion. Ctype is used when the conversion is between the expression and the type.

Question 9

What are Generics in C#?

Accepted Answer

In C#, the term “generic” refers to a type of class that is not limited to a specific data type. Generics are declared by including a type parameter, represented by  , after the type name, such as in TypeName  . Generics are used to reduce code redundancy and raise type safety and performance.

Question 10

Give an example of Boxing and Unboxing in C#.

Accepted Answer

Boxing is the process that converts a value type to the type object or to any interface type implemented by this value type. Here is an example of how boxing is used in C#.   
Unboxing converts from the type object to a value type or from an interface type to a value type that implements the interface.    
These statements show both boxing and unboxing operations:

int i = 123;      // a value type 
object o = i;     // boxing 
int j = (int)o;   // unboxing

Question 11

Give an example of late binding and early binding in C#.

Accepted Answer

Early binding   
 Input:

using System; 
class Ninjas{ 
    public string name; 
    public string language; 
    public void Set_value(string name, string language) 
    { 
        this.name=name; 
        this.language=language; 
        Console.WriteLine("My name is: "+name); 
        Console.WriteLine("My Favorite Programming language is: "+language); 
    } 
} 
class Program 
{ 
    static void Main(string[] args) 
    { 
        Ninjas obj=new Ninjas(); 
        obj.Set_value("Alok", "C#"); 
        obj.Display(); 
    } 
}

Output 
 
prog.cs(19,13): error CS1061: Type `Ninjas' does not contain a definition for `Display' and no extension method `Display' of type `Ninjas' could be found. Are you missing an assembly reference? 
prog.cs(2,7): (Location of the symbol related to previous error) 
Compilation failed: 1 error(s), 0 warnings   
Late binding:  
Input

using System; 
class Ninjas 
{ 
    static void Main(string[] args) 
    { 
        dynamic Dyn_obj1=4; 
        dynamic Dyn_obj2=5.678; 
        dynamic Dyn_obj3="Ninjas"; 
        Console.WriteLine("The type of the above dynamic objects:"); 
        Console.WriteLine(Dyn_obj1.GetType()); 
        Console.WriteLine(Dyn_obj2.GetType()); 
        Console.WriteLine(Dyn_obj3.GetType()); 
    } 
}

Output  
The type of the above dynamic objects:  
System.Int32  
System.Double  
System.String

Question 12

Write a program in C# Sharp to reverse a string.

Accepted Answer

nternal static void ReverseString(string str)  
{  
    
  char[] charArray = str.ToCharArray();  
  for (int i = 0, j = str.Length - 1; i

Question 13

Write a program in C# Sharp to find if a given string is palindrome or not.

Accepted Answer

internal static void chkPalindrome(string str)  
{  
   bool flag = false;  
   for (int i = 0, j = str.Length - 1; i  
  
Output  
Input: Key Output: Not Palindrome  
Input: step on no pets Output: Palindrome

Question 14

Write a program in C# Sharp to reverse the order of the given words.

Accepted Answer

internal static void ReverseWordOrder(string str)  
{  
  int i;  
  StringBuilder reverseSentence = new StringBuilder();  
   int Start = str.Length - 1;  
  int End = str.Length - 1;  
   while (Start > 0)  
  {  
      if (str[Start] == ' ')  
      {  
          i = Start + 1;  
          while (i

Question 15

Write a C# program to find the substring from a given string.

Accepted Answer

internal static void findallsubstring(string str)  
{  
   for (int i = 0; i

Question 16

Write a C# program to find out if a positive integer is prime or not.

Accepted Answer

static void Main(string[] args)

{

if (FindPrime(47))

{

Console.WriteLine("Prime");

}

else

{

Console.WriteLine("Not Prime");

}

Console.ReadLine();

}

internal static bool FindPrime(int number)

{

if (number == 1) return false;

if (number == 2) return true;

if (number % 2 == 0) return false;

var squareRoot = (int)Math.Floor(Math.Sqrt(number));

for (int i = 3; i

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