Encryption/Decryption cache files

Thanks for the insight, we compiled using the modification suggested and all is well.

I'm also working on the program experiencing the System.OutOfMemoryException error and wanted to add in a few things.

We are using sample code from the Security Encrypting a Local Cache File learning unit. The main modification we made to the code is to help in catching errors. And as was mentioned previously we are receiving this error when we attempt to decrypt the EntitySet before restoring it.

Saving and restoring smaller EntitySets would be helpful in correcting this problem, but I didn't see anything in the learning units regarding this. Are there any resources or samples that would show how to cache only objects of EntityType Customer to a local cache file?

Afraid we can't help with the differences between WEPOS and Windows 7 (a WEPOS forum might be able to help with why 2G of memory could be sufficient in standard Windows but not WEPOS), but we can help troubleshoot the general out-of-memory problem.You didn't say how you're doing encryption/decryption.  Are you using sample code from one of the learning units or your own?

• An out-of-memory problem during serialization or deserialization is usually due to problems with the allocation of progressively larger buffers. You can sometimes fix this by setting the capacity on a *Stream or StringBuilder in its constructor to the size needed.  
• Try calling GC.Collect before doing the restore.
• Think about saving and restoring smaller EntitySets.  Instead of caching all entities within a PM into a single file, maybe create smaller cache files by functionality or feature.
• Try using the EntityDataSetSurrogate directly.  This is the what is actually used under the hood.  If you serialize/deserialize it directly you'll have more control over this logic.