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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Datatypes tutorials tutorials

  • In C#, variables are categorized into the following three types:

    1. Value types

    2. Reference types

    3. Pointer types

1) Value type:

  • Variable that are based on value types directly contain a values. Assigning one value type variable to another copies the contained value. 

  • Some examples of value type are int, char, float, which stores numbers, alphabets and floating point numbers

  • All value types are derived implicitly from the System.ValueType.

  • Value types are stored in stack memory.

  • When you declare an int type, the system allocates memory to store the value.

2) Reference Types:

  • A variable holds a reference to the value, then that type of data types are reference types.

  • These reference types are stored in heap memory and these types are not fixed in size. 

  • They are maintained in system managed heap but it also uses stack to store reference of the heap

  • Example of built in reference types are:

  1. object 

  • The object type is an alias for Object in the .NET Framework. In the unified type system of C#, all types, predefined and user-defined, reference types and value types, inherit directly or indirectly from Object.

  • You can assign values of any type to variables of type object. When a variable of a value type is converted to object, it is said to be boxed. When a variable of type object is converted to a value type, it is said to be unboxed. 


int i = 100;

object o = (object)i; // this is boxing


object o= 100;

i = (int)o; // this is unboxing

  1. String

  • The string type represents a sequence of zero or more Unicode characters. string is an alias for String in the .NET Framework.


string a =”Hello C#”;

  1. class

  • Classes are declared using the keyword class, it contain the data member and member function.


class TestMyClass


// Methods, properties, fields, events, delegates

// and nested classes go here.


  1. Interface

  • An interface contains only the signatures of methods, delegates or events. The implementation of the methods is done in the class that implements the interface


interface ISampleInterface


void SampleMethod(); //Empty method


  1. Delegate

  • The delegate keyword is used to declare a reference type that can be used to encapsulate a named or an anonymous method. Delegates are similar to function pointers in C++.

  • However, delegates are type-safe and secure. 


public delegate void TestMyDelegate(string message);


3)    Pointer Types:

  • The type specified before the * in a pointer type is called the referent type of the pointer type. It represents the type of the variable to which a value of the pointer type points.

  • Unlike references values of reference types, pointers are not tracked by the garbage collector the garbage collector has no knowledge of pointers and the data to which they point.

  • Syntax for declaring a pointer type is:

Type* identifier;


int* num;

char* ch;

This above declaration says that num is int pointer and ch is char pointer, in C# pointers are used in unsafe code
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