<p>Are C# enums typesafe?</p>

<p>If not what are the implications? </p>

Yes they are.
The following is from
http://www.csharp-station.com/Tutorials/Lesson17.aspx
Enums are strongly typed constants. They are essentially unique types that allow you to assign symbolic names to integral values. In the C# tradition, they are strongly typed, meaning that an enum of one type may not be implicitly assigned to an enum of another type even though the underlying value of their members are the same. Along the same lines, integral types and enums are not implicitly interchangable. All assignments between different enum types and integral types require an explicit cast.