Erasing files and folders in .NET

I've got an eraser class in my .NET application.

It allows user to delete files and folders securely, without a chance to recover erased data by any file recovery software.

Currently it works by opening the file in binary mode and filling the size with random bytes.

I'm afraid 开发者_C百科the solution is not reliable. While the contents gets erased, file record itself (file name, size, attributes), remains recoverable.

The question is - how to erase the system data related to specific file or folder. I think managed code can't help here and Windows API should be used.

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Overwrite with random data, change the file attributes, rename the file several times, change the file size, and only then delete the file?