如何判断发言是否为空？

if len(usersays)<>0 then
session("whoto")=request.form("whoto")
session("action")=request.form("action")
if instr(usersays,chr(39))>0 then
usersays=replace(usersays,chr(39),""&chr(39))
end if
if instr(usersays,chr(34))>0 then
usersays=replace(usersays,chr(34),""&chr(34))
end if

application.lock

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