http://blogs.msdn.com/fxcop/archive/2006/04/27/faq-why-does-donotexposegenericlists-recommend-that-i-expose-collection-lt-t-gt-instead-of-list-lt-t-gt-david-kean.aspxDoNotExposeGenericLists fires when I publicly expose List&lt;T&gt; via a field, method, property, or parameter. Why? Although Krzysztof briefly touched on this last year , we wanted to expand on this a little through the use of examples. The first reasonen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/fxcop/archive/2006/04/27/faq-why-does-donotexposegenericlists-recommend-that-i-expose-collection-lt-t-gt-instead-of-list-lt-t-gt-david-kean.aspx#587684Mon, 01 May 2006 20:41:55 GMT91d46819-8472-40ad-a661-2c78acb4018c:587684Ayende RahienBut data binding doesn't work against Collection&lt;T&gt;http://blogs.msdn.com/fxcop/archive/2006/04/27/faq-why-does-donotexposegenericlists-recommend-that-i-expose-collection-lt-t-gt-instead-of-list-lt-t-gt-david-kean.aspx#587882Mon, 01 May 2006 23:51:27 GMT91d46819-8472-40ad-a661-2c78acb4018c:587882David M. KeanAyende, <BR><BR>Are you sure about that? I just tried binding a Collection&lt;T&gt; to a combobox and it worked like a charm. <BR><BR>It implements the same interfaces as List&lt;T&gt;, so can you point to a situation (maybe a code sample) where it doesn't work? That way we can either fix our docs or file a bug on the databinding side.http://blogs.msdn.com/fxcop/archive/2006/04/27/faq-why-does-donotexposegenericlists-recommend-that-i-expose-collection-lt-t-gt-instead-of-list-lt-t-gt-david-kean.aspx#1176444Thu, 30 Nov 2006 10:32:05 GMT91d46819-8472-40ad-a661-2c78acb4018c:1176444Javier G. Lozano