There are words which cannot be used as the name of an entity or application:

• abstract

• addressof

• App_Code

• App_Data

• as

• asp

• aspx

• assert

• base

• bool

• boolean

• break

• byte

• case

• catch

• char

• checked

• class

• clear

• close

• config

• const

• context

• continue

• cs

• css

• date

• decimal

• default

• delegate

• delete

• dim

• do

• document

• double

• else

• end

• enum

• escape

• eval

• event

• exception

• explicit

• extends

• extern

• FALSE

• field

• final

• finally

• fixed

• float

• for

• foreach

• friend

• function

• get

• goto

• handles

• if

• images

• implements

• implicit

• import

• in

• index

• inherits

• instanceof

• int

• interface

• internal

• is

• java

• js

• jsp

• lock

• long

• me

• mustoverride

• mybase

• myclass

• namespace

• native

• new

• next

• nothing

• notoverridable

• null

• object

• open

• operator

• out

• overridable

• override

• overrides

• package

• page

• params

• private

• protected

• public

• put

• readonly

• redim

• ref

• return

• sbyte

• screen

• sealed

• shadowing

• short

• sizeof

• stackalloc

• static

• strictfp

• string

• struct

• sub

• substring

• super

• switch

• synchronized

• target

• this

• throw

• throws

• tostring

• transient

• TRUE

• try

• typeof

• uint

• ulong

• unchecked

• undefined

• unsafe

• until

• ushort

• using

• value

• var

• vb

• virtual

• void

• volatile

• while

• window

• withevents

• write