Deserialization from byte array

[bootcom]

Afternoon all,

Coming up against a brick wall with sending items over the network using sockets. I'm using Chilkat rather than the built in TCP Client / listener but thats not the issue. From point a I send through a string converted to base64 as below

Public Function fn_ArrayListToBytes(ByVal arrTmp As ArrayList) As Byte()

        Dim rawFoo As New MemoryStream
        Dim formatterIn As New BinaryFormatter
        formatterIn.Serialize(rawFoo, arrTmp)
        rawFoo.Seek(0, SeekOrigin.Begin)
        Dim fooBytes As Byte() = New Byte(rawFoo.Length) {}
        rawFoo.Read(fooBytes, 0, rawFoo.Length)

        Return fn_encrypt_byte(fooBytes)

    End Function

So at point b I want to convert that back and the code I have is as follows:

 
Public Function fn_ArrayListFromBytes(ByVal bytTmp As Byte()) As ArrayList

        Dim objBinaryFormatter As New BinaryFormatter
        Dim newRawFoo As New MemoryStream(fn_decrypt_byte(bytTmp))
        Dim RebuiltArraylist As ArrayList = objBinaryFormatter.Deserialize(newRawFoo)

        Return RebuiltArraylist

    End Function

[bootcom]

Please see the associated error as I'm getting (attached).

I've also got a windows explorer view that goes over the sockets but when that comes back, depending on folder totals it crashes out completely.