best proceed controlling list<t> exposing collection<t>


i contingency exercise web use arrangement list values (integers, tradition classes etc).
my operative fortitude advantage list<t>, according fxcop improved relapse collection<t> readonlycollection<t>.



if i select relapse readonlycollection<t>, web use shows an blunder like:




to xml serializable, forms get icollection contingency have an doing add(system.int32) during levels estate hierarchy.
system.collections.objectmodel.readonlycollection 1 [[system.int32, mscorlib, version=2.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089]] does exercise add(system.int32).




what your favorite proceed internally list<t> arrangement collection<t> ? (using c#, preferably horizon 2.0 only)



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