What kind of encoding is neccessary for cookies?

For cookie what kind of encoding should be performed (converting a byte array to t开发者_如何学Cext) ?

Base64 ?
UrlEncode ?
...

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You don't need any encoding. To prevent user tampering, the simplest solution is to use sessions (which typically uses ASP.NET_SessionId behind the scenes), rather than making custom cookies.

EDIT: If you really need to store an arbitrary byte array, base 64 will work. But you should explain why you want to do this.

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I personally will MD5 encode an ID and store just about everything in a DB or if i can change the db use a GUID instead of a incrementing ID

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Base64-encoded strings are not valid for URLs or cookies. There are a number of variations on base64 encoding that avoid the forbidden characters. In .NET, you can use HttpServerUtility.UrlTokenEncode() and .UrlTokenDecode().

See https://stackoverflow.com/a/1789179/24315