Hey,

    I'm sure this is something simple I'm not realizing has to be done for session state, but here is my problem.  I have a file class that has some general information and then it has a List(Of fileProperty) where fileProperty is another sub class.   Before this I was using List(Of Array List).  With the arraylist it went into the session state and came back out no problem.  But after switching array list to my own file property class the sub class of file property is being lost.  For instance the user will instantiate a file and add some properties.  Then throw it in session state. Upon pulling the file out of session state I can access the basic properties such as name, size, ext, etc. just fine.  But if I go to access the List of properties it returns nothing since the list is now empty.   It's pretty much the fileProperty class doesn't know it should follow the file class into session state and I don't know what to use to make that happen.  I'm guessing this is where serializable or something like it comes into play, but I'm not a hundred percent sure.  Thanks!

Do you have a code example? I wrote a quick example with a fileproperties list and the session stored the list properly... 

Here's the file class:

Imports Microsoft.VisualBasic

Imports System.Collections.ArrayList

Imports System.Collections.Generic

Imports fileProperty

Private fileName As String = String.Empty

Private fileSize As String = String.Empty

End Sub

fileName = "Empty"

End Sub

fileProps.Add(New fileProperty(prop, value, type))

End Sub

End Sub

ReadOnly Property count() As Integer

Get

End Get

End Property

ReadOnly Property name() As String

Get

End Get

End Property

ReadOnly Property size() As String

Get

End Get

End Property

ReadOnly Property ext() As String

Get

End Get

End Property

Get

For i As Integer = 0 To fileProps.Count - 1

Next

If tempStringCollection.Count > 0 Then

Else

Return Nothing

End If

End Get

End Property

ReadOnly Property getPropFromValue(ByVal givenValue As String) As String

Get

If CType(fileProps(i), fileProperty).value = givenValue Then

End If

Next

Return Nothing

End Get

End Property

Get

For i As Integer = 0 To fileProps.Count - 1

If CType(fileProps(i), fileProperty).name = prop Then

End If

Next

If tempStringCollection.Count > 0 Then

Else

Return Nothing

End If

End Get

End Property

Get

End Get

End Property

ReadOnly Property isPropsEmpty() As Boolean

Get

If fileProps.Count = 0 Then

Return True

Else

Return False

End If

End Get

End Class

And here's the file property class:

Private propType As String = String.Empty

End Sub

End Sub

ReadOnly Property name() As String

Get

End Get

End Property

ReadOnly Property value() As String

Get

End Get

End Property

ReadOnly Property type() As String

Get

End Get

End Class

Now in my program I have a list of the loadedFile class types.  When I throw it into session state and bring it back out I can access the basic types of the class, but when I go to access the list of the fileproperty class the list is empty and the references to the fileproperty class have been lost.  Weird thing is when I used the same code with .net Array list it worked just fine.  I switched it so anyone using the classes could use LoadedFile.prop(i).name instead of LoadedFile.prop(i) returning an array list they then had to know something about.  Only thing I can figure is in the array list class they're using serializable or something like that to bring it in.  Not really sure what I'm missing, but I'm sure I'll want to kick myself once I find out

 Are you using Visual Studio 2008 or 2005? I'm running this same code in vs 2008 and it's working...

I ran this code in default.aspx

Dim lc As New LoadedFile("test.jpg", 1)
lc.addProperty("prop", "value", "type")
lc.addProperty("prop1", "value1", "type1")

Session("test") = lc

Ran this code in default.aspx and was able to access the file properties:

Dim lc As LoadedFile = CType(Session("test"), LoadedFile)

Thanks for the replies and I found what was happening.  *kicks himself*  It was coder error.  I was using a clear function which still exists with the array list path I was going down and I missed a call to the clear function that still existed in the code.  It's always something simple and usually stupid [:-P] .    Thanks for the replies and sorry for wasting time.

Bladewing2