>>>The way around this is to create a second model that has only the fields you want to update. In fact, that's probably best practice as you only query the data you really need.
>>>
>>
>>Is it the only way? Say, I still want to be able to change ModifiedOn, ModifiedBy if I am editing and the first two if I am inserting.
>>
>>In other words, I may want to set ReadOnly attribute but conditionally.
>
>You could leave the EF model as is but create additional MVC models. More work though since you'd have to update the EF model from the MVC model in code....

I have one MVC model which I use in both Edit and Add dialog which is the same view in my case. I don't know if I can still use the same view but different models depending on the Add vs. Edit - that may be an alternative solution.

Also, the EF model is a property of my MVC model, e.g. I have Client Client property of MVC model.

I also got an interesting response in my MSDN thread
http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/656588a3-938f-489c-ac40-10c8e18057de/

May be I can re-set current value to original value before save.