Trying to set Dimblk VB.net

Evening everyone - I was curious if anyone knew a good way that I can get the objectid of a block when a block name is known and in the dwg. I have been having a hard time getting it to work right... I am still trying to learn vbnet. Secondly once I obtain that objectid i am trying to set Dimblk to that id. However if the id is not present I will need to import it. Sorry if this has been asked, but I haven't found very many solutions that make much sense for what i am trying to do or they are coded in such a way that I am unsure how to apply it to my code. Here is the code i have thus far:

Private Function crwn_initdim(ByVal dimname As String, ByVal dimscale As Double, ByVal dimangdec As Integer, ByVal dimaltunits As Integer, ByVal dimaltdec As Integer, _
                                ByVal dimaltf As Integer, ByVal dimaltround As Integer, ByVal dimaltdec1 As Integer, ByVal dimaltzsup As Integer, ByVal dimaltunits1 As Integer, _
                                ByVal dimaltsup As Integer, ByVal dimapost As String, ByVal dimarcsymbol As Integer, ByVal dimarrowsize As Integer, ByVal dimatfit As Integer, _
                                ByVal dimaunit As Integer, ByVal dimazin As Integer, ByVal dimblock As String)
       Dim crwn_dimid As ObjectId = Nothing 'dimid
       Dim crwn_doclock As DocumentLock = Application.DocumentManager.MdiActiveDocument.LockDocument()
       Dim crwn_database As Database = Application.DocumentManager.MdiActiveDocument.Database
       Dim crwn_transaction As Transaction = crwn_database.TransactionManager.StartTransaction()
       Dim crwn_dimstyle As DimStyleTableRecord


       Try
           Dim crwn_dimblktbl As BlockTable = crwn_transaction.GetObject(crwn_database.BlockTableId, OpenMode.ForNotify, False)
           Dim crwn_dimtable As DimStyleTable = crwn_transaction.GetObject(crwn_database.DimStyleTableId, OpenMode.ForRead, False)

           If crwn_dimblktbl.Has(dimblock) = False Then
               MsgBox("Warning")
           Else
               'ObjectId
           End If

           If crwn_dimtable.Has(dimname) = False Then
               crwn_dimstyle = New DimStyleTableRecord
               crwn_dimstyle.Name = dimname
               crwn_dimstyle.Dimscale = dimscale
               crwn_dimstyle.Dimadec = dimangdec
               crwn_dimstyle.Dimalt = dimaltunits
               crwn_dimstyle.Dimaltd = dimaltdec
               crwn_dimstyle.Dimaltf = dimaltf
               crwn_dimstyle.Dimaltrnd = dimaltround
               crwn_dimstyle.Dimalttd = dimaltdec1
               crwn_dimstyle.Dimalttz = dimaltzsup
               crwn_dimstyle.Dimaltu = dimaltunits1
               crwn_dimstyle.Dimaltz = dimaltsup
               crwn_dimstyle.Dimapost = dimapost
               crwn_dimstyle.Dimarcsym = dimarcsymbol
               crwn_dimstyle.Dimasz = dimarrowsize
               crwn_dimstyle.Dimatfit = dimatfit
               crwn_dimstyle.Dimaunit = dimaunit
               crwn_dimstyle.Dimazin = dimazin
               crwn_dimstyle.Dimblk = dimblock

               crwn_dimtable.UpgradeOpen()
               crwn_dimtable.Add(crwn_dimstyle)
               crwn_transaction.AddNewlyCreatedDBObject(crwn_dimstyle, True)
               crwn_dimtable.DowngradeOpen()
           End If
           crwn_dimid = crwn_dimtable.Item(dimname)
           crwn_transaction.Commit()
       Catch ex As Exception
           crwn_transaction.Abort()
       Finally
           crwn_transaction.Dispose()
           crwn_doclock.Dispose()
       End Try
       Return crwn_dimid
   End Function