vb.net - Collection with sub- collection -

lets suppose have forum 1 thread 3 posts.

i want final result:

dim myfourm new fourm myfourm.thread.add(545)''for ex 545 mean thread id.  myforum.thread(0).post(1).username 

thread should collection of integer(=thread id) post should collection of post type

so in case, code "chose first thread, , second post , retrieve username of write post"

public class fourm 'thread should inside class , background code end class  public class post public property username string public property postcontent string end class 

just clear: goal organize collections. each thread should have own posts.

i chose forum @ example, else .. if not clear please me .. not native language(but not worry - can read. ;))

in correct project iam using dictionary. want explore more.. anyway, tried "you have use collection of thread each thread instance has collection of post" , result:

public class mainfrm     private sub form1_load(sender object, e eventargs) handles mybase.load         dim myforum new forum         myforum.thread.add(500)' id's         myforum.thread.add(120)           myforum.thread(0).posts.add(new forumpost() {.postcontent = "therad id: 500 | post: 1#", .username = "don"})         myforum.thread(0).posts.add(new forumpost() {.postcontent = "therad id: 500 | post: 2#", .username = "shon"})         myforum.thread(0).posts.add(new forumpost() {.postcontent = "therad id: 500 | post: 3#", .username = "ron"})          myforum.thread(1).posts.add(new forumpost() {.postcontent = "therad id: 120 | post 1#", .username = "emi"})           ithread = 0 myforum.thread.count - 1             ipost = 0 myforum.thread(ithread).posts.count - 1                 static pst new forumpost                 pst = myforum.thread(ithread).posts(ipost)                 console.writeline($"content:{pst.postcontent}, username post it:{pst.username}")             next         next     end sub end class public class forum     public property thread new threadcollection  end class  public class forumthread     inherits list(of integer)     public property posts new postcollection     sub new(id integer)      end sub end class  public class threadcollection     inherits list(of forumthread)     public overloads sub add(byval id integer)         mybase.add(new forumthread(id))     end sub  end class  public class forumpost     public property username string     public property postcontent string end class  public class postcollection     inherits list(of forumpost) end class     '   content:therad id: 500 | post: 1#, username post it:don  '  content:therad id: 500 | post: 2#, username post it:shon  '  content:therad id: 500 | post: 3#, username post it:ron  '   content:therad id: 120 | post 1#, username post it:emi 

now question is: supposed this? or there better way write this?