I don't think you can do that directly，and in my mind，I think you can try to check whether a specific student instance has IEnumerable<Course> Course is null or its Count is larger than 0 or not，before you do inserting it into your db。
Reguards！
Marked as answer by ZahidBashir on Mar 03, 2012 09:26 AM
Decker Dong ...
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Re: MVC 2 Validating Many to Many Property
Mar 03, 2012 12:20 AM|LINK
Hello：）
I don't think you can do that directly，and in my mind，I think you can try to check whether a specific student instance has IEnumerable<Course> Course is null or its Count is larger than 0 or not，before you do inserting it into your db。
Reguards！