Is the XMLSignature class blocking a file?

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Hi,   I'm using the XMLSignature class to verify the sign of a document: I'm receiving the signature file and the original file as byte arrays, so I create a temporal directory, and then write 2 files into the directory, one for the signature file and the other one for the original document file. Once I have verified the sign I'm trying to delete the files and the directory, but only the signature file is deleted. After doing some test I have determined that the problem is with the checkSignatureValue methods (in both, the one that receive a pk, and the one that receive a cert) that looks like it is blocking the original document file and does not unlock it after the verification...   Anyone can help me? Thanks in advance!       Raśl Herranz (Spain)