How do I use MD5 and salt to generate a token

I'm trying to create a URL that is made up of a set of parameters and a token that is generated using a MD5 hash function.  I'm a beginner at hashing and using salt to generate this token.  I've got the secret key(which i believe is the salt) and the string I need to hash.   I believe that is all I need in order to create my token.  Would you have any suggestions or links on how to generate the token I need?  Please let me know if you need more information.
Thanks.

GLlanoAsked:
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joechinaConnect With a Mentor Commented:
Check this

http://msdn.microsoft.com/en-us/library/system.security.cryptography.hmacmd5.aspx

But you need to use memorystream instead of filestream in the example.

Good Luck
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GLlanoAuthor Commented:
The example on the link passes a key array into the constructor of a class.  
ex. Dim myhmacMD5 As New HMACMD5(key)

the example never shows how to create that class or what its doing with the key.  Do you
have any suggestions?

Thanks.
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joechinaCommented:
If you key is a string, just do
byte [] keyByte =  System.Text.Encoding.ASCII.GetBytes.GetBytes(key);
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