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I’ve been out of the C# game for a while since I started iPhone stuff, but how can you delete a file completely (so its not stored in memory) and isn’t recoverable. If you can’t delete it forever can you scramble it up with random data so it is unable to be opened but still exists?
It’s certainly possible to overwrite a file so that the previous content cannot be recovered. But this has to be done by the drive itself to make sure the correct block is overwritten… C# interacts with the filesystem, not physical blocks, so won’t provide any security.
The actual way to ask a drive to securely erase something varies with interface (ATAPI vs SATA, vs USB mass-storage vs SCSI vs firewire), and C# doesn’t provide a simple way of commanding at this level.