在ASP.NET编程中，尤其是涉及到C#或VB.NET这类后端语言时，你通常会遇到的是这些编程语言的保留字和关键字，而不是ASP.NET本身特有的保留字（因为ASP.NET更多的是一个框架和平台，而非语言）。不过，我可以为你整理C#和VB.NET中的一些常见关键字和保留字。
### C# 关键字和保留字
C#中有许多关键字，它们是编译器识别为具有特殊意义的单词。这些关键字不能用作标识符，如变量名、类名等。以下是一些常见的C#关键字：
abstract, as, base, bool, break, byte, case, catch, char, checked, class, const, continue,
decimal, default, delegate, do, double, else, enum, event, explicit, extern, false, finally,
fixed, float, for, foreach, goto, if, implicit, in, int, interface, internal, is, lock, long,
namespace, new, null, object, operator, out, override, params, private, protected, public,
readonly, ref, return, sbyte, sealed, short, sizeof, stackalloc, static, string, struct,
switch, this, throw, true, try, typeof, uint, ulong, unchecked, unsafe, ushort, using,
virtual, void, volatile, while
请注意，还有一些上下文关键字（contextual keywords），它们在特定上下文中具有特殊意义，但在其他情况下可以作为普通标识符使用。例如，`add`、`remove`、`value`和`get`等。
### VB.NET 关键字和保留字
VB.NET同样有许多关键字，以下是一些常见的VB.NET关键字：
vb AddHandler, AddressOf, Alias, And, AndAlso, As, Assembly, Async, Await, Boolean, ByRef, ByVal, Byte, By, Call, Case, Catch, CBool, CByte, CChar, CDate, CDec, CDbl, Char, CInt, Class, CLng, CObj, Const, Continue, CSByte, CShort, CSingle, CStr, CType, CUInt, CULng, CUShort, Date, Decimal, Declare, Default, Delegate, Dim, DirectCast, Do, Double, Each, Else, ElseIf, End, EndIf, Enum, Erase, Error, Event, Exit, Explicit, False, Finally, For, Friend, Function, Get, GetType, Global, GoSub, GoTo, Handles, If, Implements, Imports, In, Inherits, Integer, Interface, Is, IsNot, Let, Lib, Like, Long, Loop, Me, Mod, Module, MustInherit, MustOverride, MyBase, MyClass, Namespace, New, Next, Not, Nothing, NotInheritable, NotOverridable, Object, Of, On, Operator, Option, Optional, Or, OrElse, Overloads, Overridable, Overrides, ParamArray, Partial, Private, Property, Protected, Public, RaiseEvent, ReadOnly, ReDim, RemoveHandler, Resume, Return, SByte, Select, Set, Shadows, Shared, Short, Single, Static, Step, Stop, String, Structure, Sub, SyncLock, Then, Throw, To, True, Try, TryCast, TypeOf, Unicode, Until, Variant, Wend, When, While, With, WithEvents, WriteOnly, Xor请注意，这些列表并不详尽，并且可能随着语言的更新而有所变化。此外，一些关键字在特定版本或上下文中可能有不同的行为或意义。因此，在编写代码时，建议查阅最新的官方文档以获取准确的信息。