Sub Page_Load(Src As Object, E As EventArgs) If Session("NewUser") == null Then dim Cart As DataTable Cart=New DataTable( ) …………………………
If Session("NewUser") is Nothing Then
这是我使用vb的一段代码,nothing完全可用: sub page_load(sender as object,e as eventargs) if session("user_id")=nothing or session("passwd")=nothing then response.Redirect("outputcache4.aspx") end if end sub 另外,cart你事先定义了吗?如果没有,应该这样 dim Cart as datatable=New DataTable( )
If Session("NewUser") == null Then
dim Cart As DataTable
Cart=New DataTable( )
…………………………
sub page_load(sender as object,e as eventargs)
if session("user_id")=nothing or session("passwd")=nothing then
response.Redirect("outputcache4.aspx")
end if
end sub
另外,cart你事先定义了吗?如果没有,应该这样
dim Cart as datatable=New DataTable( )