C Sharp

1. An Overview of C# 2. OOP 3. C# Environment 4. IDE 5. Basic Requirement 6. Comments 7. My first program 8. Line Break 9. Escape Sequence 10. Identifiers 11. Variables 12. Datatypes 13. Range of datatypes in C# 14. Declare Variables 15. Reserved Key Words 16. Console.Write() 17. Chained & Embedded state 18. Prog.to print sum of 2 nos 19. Console.ReadLine() 20. Prg.to print sum & average 21. Area & Perimeter of Rectangle 22. Area Circumference of Circle 23. Prg.for Simple Calculator 24. Operatos in C# 25. Ex. Of Operators 26. Prg. to Swap two numbers 27. Hierarchy of Operators 28. if( ) statement 29. Prg.to check +ve,-ve or zero 30. if..else statement 31. Prg.to check Odd or Even 32. Prg.to print larger of 2 nos 33. Prg.to print largest of 3 nos 34. Prg.to check divisibility 35. Prg.to check print range 36. for. . . loop statement 37. prg.to print series of nos 38. Prg.to check divisibility 39. prg.to print sum of series 40. Prg.to print Pyramid 41. prg.for Factorial 42. prg.to fill screen 43. prg.for largest/smallest no 44. prg.to print reverse no 45. prg.to add each digit 46. prg.for sum of Factorial 47. prg.for fibonacci series 48. prg.to check Prime nos 49. prg. Prime no from 1 to 100 50. prg.Specified Prime nos 51. while( ) statement 52. do. . While statement 53. goto statement 54. break & continue statement 55. switch case statement 56. Array in C# 57. print reverse order using array 58. Ascending/Descending order 59. prg.to search no in Array 60. Multidimensional arrays 61. String in C# 62. String with spaces 63. prg.to print string in reverse 64. prg.to count A,E,I,O,U vowel 65. User Define Methods 66. Methods program example 67. General Purpose Programs 68. Loan & EMI calculation prg. 69. Table print prg. 70. Leap year program 71. lower to UPPER case prg. 72. Age Distribution prg. 73. Bank note calculation prg. 74. Simple Interest prg. 75. Compound Interest prg. 76. Simple Depreciation prg. 77. Reducing bal.Depreciation prg. 78. Marksheet prg. 79. Income Tax prg. 80. Time calculator prg. 81. Distance converter prg. 82. Volume Air Calculation prg. 83. Time to fill Water Tank prg. 84. Salary Calculation prg. 85. Total Sale Calculation prg. 86. Male/Female pecentage prg. 87. Library Rent prg. 88. Office Expance prg. 89. Total Salary Calculation prg. 90. Profit or Loss prg. 91. Total Profit/Loss prg. 92. Virtual Function . 93. C# Interview Part1 94. C# Interview Part2 95. C# Interview Part3 96. C# Interview Part4 97. C# Interview Part5 98. C# Interview Part6 99. C# Interview Part7 100. C# Interview Part8 101. C# Interview Part9 102. C# Interview Part10 103. C# Interview Part11 104. C# Interview Part12 105. C# Interview Part13 106. C# Interview Part14 107. C# Interview Part15
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C# Interview Questions and Answers Part 6

 

51.Why do I get a "CS5001: does not have an entry point defined" error when compiling?

  • The most common problem is that you used a lowercase 'm' when defining the Main method. The correct way to implement the entry point is as follows:

class test

{

static void Main(string[] args) {}

}

 

52. What are the different ways a method can be overloaded?

  • Methods can be overloaded using different data types for parameter, different order of parameters, and different number of parameters.

 

 

53. Why canít you specify the accessibility modifier for methods inside the interface?

  • In an interface, we have virtual methods that do not have method definition. All the methods are there to be overridden in the derived class. Thatís why they all are public.

 

54. How can I create a process that is running a supplied native executable (e.g., cmd.exe)?

  • The following code should run the executable and wait for it to exit before

  • continuing:

 

using System;

using System.Diagnostics;

public class ProcessTest

{

public static void Main(string[] args)

{

string app;

app = Console.ReadLine();

Process p = Process.Start(app+".exe");

p.WaitForExit();

Console.WriteLine(app+".exe" + " exited.");

}

}

  • Remember to add a reference to System.Diagnostics.dll when you compile.

 

55. List down the commonly used types of exceptions in .Net?

  • ArgumentException, ArgumentNullException , ArgumentOutOfRangeException,

  • ArithmeticException, DivideByZeroException ,OverflowException ,

  • IndexOutOfRangeException ,InvalidCastException

  • ,InvalidOperationException , IOEndOfStreamException ,

  • NullReferenceException , OutOfMemoryException , StackOverflowException etc.

 

 

56. How do I declare inout arguments in C#?

  • The equivalent of inout in C# is ref. , as shown in the following example:

 

public void MyMethod (ref String str1, out String str2)

{

...

}

  • When calling the method, it would be called like this:

 

String s1;

String s2;

s1 = "Hello";

MyMethod(ref s1, out s2);

Console.WriteLine(s1);

Console.WriteLine(s2);

  • Notice that you need to specify ref when declaring the function and calling it.

 

57. Is there a way of specifying which block or loop to break out of when working with nested loops?

  • The easiest way is to use goto:

 

using System;

class BreakExample

{

public static void Main(String[] args)

{

for(int i=0; i<3; i++)

{

Console.WriteLine("Pass {0}: ", i);

for( int j=0 ; j<100 ; j++ )

{

if ( j == 10) goto done;

Console.WriteLine("{0} ", j);

}

Console.WriteLine("This will not print");

}

done:

Console.WriteLine("Loops complete.");

}

}

 

58. What is the difference between const and static read-only?

  • The difference is that static read-only can be modified by the containing class, but const can never be modified and must be initialized to a compile time constant. To expand on the static read-only case a bit, the containing class can only modify it:

  • -- in the variable declaration (through a variable initializer).

  • -- in the static constructor (instance constructors if it's not static).

 

59. What does the parameter Initial Catalog define inside Connection String?

  • The database name to connect to.

 

60. What is the difference between Array and Arraylist?

  • In an array, we can have items of the same type only. The size of the array is fixed.

  • An arraylist is similar to an array but it doesnít have a fixed size.


 

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