vb.net and querying ldap lastLogon

I am attempting to pull back lastLogon from LDAP, which returns system.com object or some junk like that.  I am using the below code to attempt to translate that code into date/time format, but im kinda of confused.

If you use the DirectoryEntry, it marshals the value as an ADSI 
IADsLargeInteger type, which at runtime is a System.__ComObject.  This is 
annoying, but you can get the value with a little interop and some data 
munging.  This works for me:

dim entry as new DirectoryEntry("LDAP://yourdn here")
dim pwd as object = entry.Properties("lastLogon").Value
dim pwdDate as DateTime
pwdDate = DateTime.FromFileTimeUtc(GetInt64FromLargeInteger(pwd))

Function GetInt64FromLargeInteger(byval largeInteger as Object) as Int64

  dim low as int32
  dim high as int32
  dim valBytes(7) as byte

  dim longInt as IADsLargeInteger = Ctype(largeInteger, IADsLargeInteger)
  low = longInt.LowPart
  high = longInt.HighPart

  BitConverter.GetBytes(low).CopyTo(valBytes, 0)
  BitConverter.GetBytes(high).CopyTo(valBytes, 4)

  Return BitConverter.ToInt64(valBytes, 0)

   End Function


        <ComImport(), Guid("9068270b-0939-11D1-8be1-00c04fd8d503"), 
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsDual)> _
        public interface IADsLargeInteger
             property HighPart as int32
             property LowPart as int32
        end interface

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Can someone tell me how to take the below and make it equal a textbox:
dim pwd as object = entry.Properties("lastLogon").Value

Like
pwd = textbox1.text???