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Secure Wiping of files in Compact Framework

Given the path of a string i want to wipe out the contents of a file. The natural way I thought (which maybe incorrect) was to open a FileStream to the file and write gibberish (random data perhaps taken from a RNGCryptoServiceProvider) to it. And then perhaps do this several times and then delete the file.

My problem is that while this may look logically correct, i read up on another blog that Windows might actually choose to write the file to a different place in the hard disk.

Is that the case in Windows Mobile? Will this actually be a problem? Does this writing to a different location in the hard disk apply to even flash based (SD etc) cards ?

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