linq middle join betwenn enumerable db table

i'm perplexing establish annals mislay database user submits form.
the page twin checkboxlist representing annals before alteration after.

i simply comparison values need deleted this...

//get equipment comparison selected before
var oldselecteditems = oitem oldchklspecialneeds.items.cast<listitem>()
                       where !(from nitem newchklspecialneeds.items.cast<listitem>()
                               where nitem.selected
                               name nitem.value).contains(oitem.value)
                           && oitem.selected
                       name oitem.value;

now i am perplexing something nonetheless isn't permitting it...

var itemstodelete = specialneed db.specialneeds
                           join oldselecteditem oldselecteditems specialneed.specialneedstypecd equals oldselecteditem.value
                           where specialneed.customerid == customerid

i simply only foreach loop .deleteonsubmit() any vigilant nonetheless i'm pondering there proceed functionality linq pass whole query outcome an middle join .deleteallonsubmit()

//like so
db.specialneeds.deleteallonsubmit(itemstodelete); 

any ideas?