Create Custom Data Annotation Validators?

Aug 5, 2010

Wanting to create custom data annotation validation. Are there any useful guides / samples on how to create them?

Firstly: StringLength with minimum and maximum length. I'm aware .NET 4 can do this, but want to do the same in .NET 3.5, if possible being able to define minimum length only (at least x chars), maximum length only (up to x chars), or both (between x and y chars).

Secondly: Validation using modulus arithmetic - if the number is a valid length, I wish to validate using the Modulus 11 algorithm (I have already implemented it in JavaScript, so I guess it would just be a simple porting?)

Update: Solved second problem, was just a case of copying over the JavaScript implementation and making a few tweaks, so don't need a solution for that.

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