This .NET class wraps the AcDb::MaintenanceReleaseVersion ObjectARX enumerated type. 

This is an entity containing information about the release versions.

Autodesk.AutoCAD.DatabaseServices

Public Enum MaintenanceReleaseVersion
  Release0 = 0
  Release1 = 1
  Release10 = 10
  Release100 = 100
  Release101 = &H65
  Release102 = &H66
  Release103 = &H67
  Release104 = &H68
  Release105 = &H69
  Release106 = &H6a
  Release107 = &H6b
  Release108 = &H6c
  Release109 = &H6d
  Release11 = 11
  Release110 = 110
  Release111 = &H6f
  Release112 = &H70
  Release113 = &H71
  Release114 = &H72
  Release115 = &H73
  Release116 = &H74
  Release117 = &H75
  Release118 = &H76
  Release119 = &H77
  Release12 = 12
  Release120 = 120
  Release121 = &H79
  Release122 = &H7a
  Release123 = &H7b
  Release124 = &H7c
  Release125 = &H7d
  Release126 = &H7e
  Release127 = &H7f
  Release128 = &H80
  Release129 = &H81
  Release13 = 13
  Release130 = 130
  Release131 = &H83
  Release132 = &H84
  Release133 = &H85
  Release134 = &H86
  Release135 = &H87
  Release136 = &H88
  Release137 = &H89
  Release138 = &H8a
  Release139 = &H8b
  Release14 = 14
  Release140 = 140
  Release141 = &H8d
  Release142 = &H8e
  Release143 = &H8f
  Release144 = &H90
  Release145 = &H91
  Release146 = &H92
  Release147 = &H93
  Release148 = &H94
  Release149 = &H95
  Release15 = 15
  Release150 = 150
  Release151 = &H97
  Release152 = &H98
  Release153 = &H99
  Release154 = &H9a
  Release155 = &H9b
  Release156 = &H9c
  Release157 = &H9d
  Release158 = &H9e
  Release159 = &H9f
  Release16 = &H10
  Release160 = 160
  Release17 = &H11
  Release18 = &H12
  Release19 = &H13
  Release2 = 2
  Release20 = 20
  Release2010Max = &Hff
  Release2010Newest = &He2
  Release21 = &H15
  Release22 = &H16
  Release23 = &H17
  Release24 = &H18
  Release25 = &H19
  Release26 = &H1a
  Release27 = &H1b
  Release28 = &H1c
  Release29 = &H1d
  Release3 = 3
  Release30 = 30
  Release31 = &H1f
  Release32 = &H20
  Release33 = &H21
  Release34 = &H22
  Release35 = &H23
  Release36 = &H24
  Release37 = &H25
  Release38 = &H26
  Release39 = &H27
  Release4 = 4
  Release40 = 40
  Release41 = &H29
  Release42 = &H2a
  Release43 = &H2b
  Release44 = &H2c
  Release45 = &H2d
  Release46 = &H2e
  Release47 = &H2f
  Release48 = &H30
  Release49 = &H31
  Release5 = 5
  Release50 = 50
  Release51 = &H33
  Release52 = &H34
  Release53 = &H35
  Release54 = &H36
  Release55 = &H37
  Release56 = &H38
  Release57 = &H39
  Release58 = &H3a
  Release59 = &H3b
  Release6 = 6
  Release60 = 60
  Release61 = &H3d
  Release62 = &H3e
  Release63 = &H3f
  Release64 = &H40
  Release65 = &H41
  Release66 = &H42
  Release67 = &H43
  Release68 = &H44
  Release69 = &H45
  Release7 = 7
  Release70 = 70
  Release71 = &H47
  Release72 = &H48
  Release73 = &H49
  Release74 = &H4a
  Release75 = &H4b
  Release76 = &H4c
  Release77 = &H4d
  Release78 = &H4e
  Release79 = &H4f
  Release8 = 8
  Release80 = 80
  Release81 = &H51
  Release82 = &H52
  Release83 = &H53
  Release84 = &H54
  Release85 = &H55
  Release86 = &H56
  Release87 = &H57
  Release88 = &H58
  Release89 = &H59
  Release9 = 9
  Release90 = 90
  Release91 = &H5b
  Release92 = &H5c
  Release93 = &H5d
  Release94 = &H5e
  Release95 = &H5f
  Release96 = &H60
  Release97 = &H61
  Release98 = &H62
  Release99 = &H63
  ReleaseCheckExtended = &H7d
  ReleaseCurrent = &Hc2
  ReleaseExtendedCurrent = &Hf4
  ReleaseExtendedNewest = 1
  ReleaseMax = &H7fffffff
  ReleaseNewest = &Hc2
  ReleaseUnknown = &H7ffffffe
End Enum

public enum MaintenanceReleaseVersion {
Release0 = 0,
Release1 = 1,
Release10 = 10,
Release100 = 100,
Release101 = 0x65,
Release102 = 0x66,
Release103 = 0x67,
Release104 = 0x68,
Release105 = 0x69,
Release106 = 0x6a,
Release107 = 0x6b,
Release108 = 0x6c,
Release109 = 0x6d,
Release11 = 11,
Release110 = 110,
Release111 = 0x6f,
Release112 = 0x70,
Release113 = 0x71,
Release114 = 0x72,
Release115 = 0x73,
Release116 = 0x74,
Release117 = 0x75,
Release118 = 0x76,
Release119 = 0x77,
Release12 = 12,
Release120 = 120,
Release121 = 0x79,
Release122 = 0x7a,
Release123 = 0x7b,
Release124 = 0x7c,
Release125 = 0x7d,
Release126 = 0x7e,
Release127 = 0x7f,
Release128 = 0x80,
Release129 = 0x81,
Release13 = 13,
Release130 = 130,
Release131 = 0x83,
Release132 = 0x84,
Release133 = 0x85,
Release134 = 0x86,
Release135 = 0x87,
Release136 = 0x88,
Release137 = 0x89,
Release138 = 0x8a,
Release139 = 0x8b,
Release14 = 14,
Release140 = 140,
Release141 = 0x8d,
Release142 = 0x8e,
Release143 = 0x8f,
Release144 = 0x90,
Release145 = 0x91,
Release146 = 0x92,
Release147 = 0x93,
Release148 = 0x94,
Release149 = 0x95,
Release15 = 15,
Release150 = 150,
Release151 = 0x97,
Release152 = 0x98,
Release153 = 0x99,
Release154 = 0x9a,
Release155 = 0x9b,
Release156 = 0x9c,
Release157 = 0x9d,
Release158 = 0x9e,
Release159 = 0x9f,
Release16 = 0x10,
Release160 = 160,
Release17 = 0x11,
Release18 = 0x12,
Release19 = 0x13,
Release2 = 2,
Release20 = 20,
Release2010Max = 0xff,
Release2010Newest = 0xe2,
Release21 = 0x15,
Release22 = 0x16,
Release23 = 0x17,
Release24 = 0x18,
Release25 = 0x19,
Release26 = 0x1a,
Release27 = 0x1b,
Release28 = 0x1c,
Release29 = 0x1d,
Release3 = 3,
Release30 = 30,
Release31 = 0x1f,
Release32 = 0x20,
Release33 = 0x21,
Release34 = 0x22,
Release35 = 0x23,
Release36 = 0x24,
Release37 = 0x25,
Release38 = 0x26,
Release39 = 0x27,
Release4 = 4,
Release40 = 40,
Release41 = 0x29,
Release42 = 0x2a,
Release43 = 0x2b,
Release44 = 0x2c,
Release45 = 0x2d,
Release46 = 0x2e,
Release47 = 0x2f,
Release48 = 0x30,
Release49 = 0x31,
Release5 = 5,
Release50 = 50,
Release51 = 0x33,
Release52 = 0x34,
Release53 = 0x35,
Release54 = 0x36,
Release55 = 0x37,
Release56 = 0x38,
Release57 = 0x39,
Release58 = 0x3a,
Release59 = 0x3b,
Release6 = 6,
Release60 = 60,
Release61 = 0x3d,
Release62 = 0x3e,
Release63 = 0x3f,
Release64 = 0x40,
Release65 = 0x41,
Release66 = 0x42,
Release67 = 0x43,
Release68 = 0x44,
Release69 = 0x45,
Release7 = 7,
Release70 = 70,
Release71 = 0x47,
Release72 = 0x48,
Release73 = 0x49,
Release74 = 0x4a,
Release75 = 0x4b,
Release76 = 0x4c,
Release77 = 0x4d,
Release78 = 0x4e,
Release79 = 0x4f,
Release8 = 8,
Release80 = 80,
Release81 = 0x51,
Release82 = 0x52,
Release83 = 0x53,
Release84 = 0x54,
Release85 = 0x55,
Release86 = 0x56,
Release87 = 0x57,
Release88 = 0x58,
Release89 = 0x59,
Release9 = 9,
Release90 = 90,
Release91 = 0x5b,
Release92 = 0x5c,
Release93 = 0x5d,
Release94 = 0x5e,
Release95 = 0x5f,
Release96 = 0x60,
Release97 = 0x61,
Release98 = 0x62,
Release99 = 0x63,
ReleaseCheckExtended = 0x7d,
ReleaseCurrent = 0xac,
ReleaseExtendedCurrent = 0xde,
ReleaseExtendedNewest = 1,
ReleaseMax = 0x7fffffff,
ReleaseNewest = 0xac,
ReleaseUnknown = 0x7ffffffe
}