Data Types :

Basic Data Types :

Type	Represent	Range
bool	Boolean value	True or False
byte	8-bit unsigned integer	0 to 255
char	16-bit Unicode character	U +0000 to U +ffff
decimal	128-bit precision decimal values	(-7.9 x 1028 to 7.9 x 1028)/100 to 28
double	64-bit double-precision floating point type	(+/-)5.0 x 10-324 to (+/-)1.7 x 10308
float	32-bit single-precision floating point type	-3.4 x 1038 to + 3.4 x 1038
Int	32-bit signed integer type	-2,147,483,648 to 2,147,483,647
long	64-bit signed integer type	-923,372,036,854,775,808 to 9,223,372,036,854,775,807
sbyte	8-bit signed integer type	-128 to 127
short	16-bit signed integer type	-32,768 to 32,767
uint	32-bit unsigned integer type	0 to 4,294,967,295
ulong	64-bit unsigned integer type	0 to 18,446,744,073,709,551,615
ushort	16-bit unsigned integer type	0 to 65,535

value types and reference types :

• Value types
• Simple Types
• Signed integral: sbyte, short, int, long
• Unsigned integral: byte, ushort, uint, ulong
• Unicode characters: char
• IEEE floating point: float, double
• High-precision decimal: decimal
• Boolean: bool
• Enum types
• User-defined types of the form enum E {...}
• Struct types
• User-defined types of the form struct S {...}
• Nullable value types
• Extensions of all other value types with a null value
• Reference types
• Class types
• Ultimate base class of all other types: object
• Unicode strings: string
• User-defined types of the form class C {...}
• Interface types
• User-defined types of the form interface I {...}
• Array types
• Single- and multi-dimensional, for example, int[] and int[,]
• Delegate types
• User-defined types of the form delegate int D(...)

C# Reserved Keywords :

1. abstract
2. as
3. base
4. bool
5. break
6. byte
7. case
8. catch
9. char
10. checked
11. class
12. const
13. continue
14. decimal
15. default
16. delegate
17. do
18. double
19. else
20. enum
21. event
22. explicit
23. extern
24. false
25. finally
26. fixed
27. float
28. for
29. foreach
30. goto
31. if
32. implicit
33. In
34. in (generic modifier)
35. int
36. interface
37. internal
38. is
39. lock
40. long
41. namespace
42. new
43. null
44. object
45. operator
46. out
47. out (generic modifier)
48. override
49. params
50. private
51. protected
52. public
53. readonly
54. ref
55. return
56. sbyte
57. sealed
58. short
59. sizeof
60. stackalloc
61. static
62. string
63. struct
64. switch
65. this
66. throw
67. true
68. try
69. typeof
70. uint
71. ulong
72. unchecked
73. unsafe
74. ushort
75. using
76. virtual
77. void
78. volatile
79. while

Note : Here we mix/shuffle all Reserved Keywords with 2 colors , cause if all options is belong some color then we think some time reader confused which one he read or which one not (mistake) so, here we use 2 type colors.

Identifiers :

An identifier is a name used to identify a class, variable, function, or any other user-defined item. The basic rules for naming classes in C# are as follows:

• A name must begin with a letter that could be followed by a sequence of letters, digits (0 - 9), or underscore. The first character in an identifier cannot be a digit.


• It must not contain any embedded space or symbol like ? - +! @ # % ^ & * ( ) [ ] { } . ; : " ' / and \. However, an underscore ( _ ) can be used.


• It should not be a C# keyword.