AES-PKCS7 Padding Encryption - vb.net

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Hi.

I have to encrypt a string with AES - PKCS7 Padding in VB.NET.

I don't know anything about en/decryption and I have asked google before...but without a result.. :(

I have received this description to do that:
The PKCS #7 padding string consists of a sequence of bytes, each of which is equal to the total number of padding bytes added.
The following example shows how these modes work. Given a blocklength of 8, a data length of 9, the number of padding octets equal to 7, and the data equal to FF FF FF FF FF FF FF FF FF:
Data: FF FF FF FF FF FF FF FF FF
PKCS7 padding: FF FF FF FF FF FF FF FF FF 07 07 07 07 07 07 07


So can you help me?


Thanks...

Z