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 9

 

81. Can you store multiple data types in System.Array?

  • No.

 

82. What is the difference between a Struct and a Class?

  • Structs are value-type variables and classes are reference types.

  • Structs stored on the stack, causes additional overhead but faster retrieval.

  • Structs cannot be inherited.

 

83. What are C# attributes and its significance?

  • C# provides developers a way to define declarative tags on certain entities eg. Class, method etc. are called attributes.

  • The attribute’s information can be retrieved at runtime using Reflection.

 

84. Does C# support multiple inheritance?

  • No, use interfaces instead.

 

85. Can multiple catch blocks be executed?

  • No, once the proper catch code fires off, the control is transferred to the finally block (if there are any), and then whatever follows the finally block.

 

86. Can you override private virtual methods?

  • No, moreover, you cannot access private methods in inherited classes, have to be protected in the base class to allow any sort of access.


 

87. What is a pre-requisite for connection pooling?

  • Multiple processes must agree that they will share the same connection, where every parameter is the same,

 

88. What are generics in C#.NET?

  • Generics are used to make reusable code classes to decrease the code redundancy, increase type safety and performance.

  • Using generics, we can create collection classes. To create generic collection, System.Collections.

  • Generic namespace should be used instead of classes such as ArrayList in the System.Collections namespace.

  • Generics promotes the usage of parameterized types.

 

89. How to implement singleton design pattern in C#?

  • In singleton pattern, a class can only have one instance and provides access point to it globally.

Eg:

 

Public sealed class Singleton

{

Private static readonly Singleton _instance = new Singleton();

}

 

90. What is the wildcard character in SQL?

  • Let us say you want to query database with LIKE for all employees whose name starts with La. The wildcard character is %, the proper query with LIKE would involve La%.


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