VB.NET - NetworkCredential to Serializable for StateServer

I am useing StateServer for session but problem is I canot save NetWorkCredential object into session. 
how I set that object into serializable.

thanks

the details of the exception that is thrown.

if it turns out that StateServer cannot serialize / deserialize the class instance, you can simply store the domain, userName and password properties and use them to reconstruct a new, identical NetworkCreedential object out of Session.

Here is the error but problem if I set any Binary object then I have same problem.

The type System.Net.NetworkCredential in Assembly System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 is not marked as serializable.

Dim sw As New IO.MemoryStream
            Dim b As New BinaryFormatter
            b.Serialize(sw, SessionObject)
            Session(SessionName) = sw.ToArray

NetworkCredential is not serializable, therefore the StateServer serialization framework is unable to put it into a format that can be stored and deserialized back into a NetworkCredential object when you request it back out.

Therefore, the simple solution, as stated, is to store the important PROPERTIES of the NetworkCredential object (userName, Password, Domain, etc) and when you need them back out, create a new instance of the NetworkCredential class and assign the retrieved property values back to it. 

Any reason why this would be a problem?

So that mean we canot save any object class into session if we useing stateserver?

can only save objects that are Serializable via one of the serialization classes (typically BinaryFormatter). Now one way around this is to build your own custom NetworkCredentials class possibly deriving it from NetworkCredentials, and marking your class a serializable. 

All the NetworkCredentials class does is neatly package up and properly format the user, password and domain for authentication purposes, it has no other "magic" in it.