Generating (presumably) unique `nonce` fields for Twitter OAuth
If I understand the requirements correctly, Guid.NewGuid().ToString("N") would work for generating a nonce.


  A GUID is a 128-bit integer (16 bytes) that can be used across all computers and networks wherever a unique identifier is required. Such an identifier has a very low probability of being duplicated.


The "N" format specifier will return the GUID as 32 (lowercase) hexadecimal digits.