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    <p>Why not look at <a href="http://subsonicproject.com/" rel="nofollow noreferrer">subsonic</a>? I like it over the others because it's lightweight maps transparently to the database scheme (uses ActiveRecord) and fulfills all your requirements.</p> <blockquote> <p>It has to be very productive.</p> </blockquote> <p>I think this is the job of every ORM? With subsonic you can use the Controller (for databinding) or just execute the Save method on any ORM object.</p> <blockquote> <p>It should allows me to extend the objects</p> </blockquote> <p>Extending the generated classes is easy, they are all defined as partials. And you can even edit the templates. (They are T4 templates you include in your project, so you have complete control over how and what is generated)</p> <blockquote> <p>It has to be (at least allmost) database agnostic</p> </blockquote> <p>I think this is kinda basic for any ORM. Subsonic supports a lot of database of which the well knowns are: Oracle, mySql, MsSql, SqlLite, SqlCE. You can look at the database support list <a href="http://subsonicproject.com/docs/Supported_Databases" rel="nofollow noreferrer">here</a>.</p> <blockquote> <p>It has to have not so much configuration or must be based on conventions</p> </blockquote> <p>Yes, it is absolutely convention over configuraion or opinionated as they call it. For a summary of the conventions look <a href="http://subsonicproject.com/docs/Conventions" rel="nofollow noreferrer">here</a>.</p> <blockquote> <p>It should allows me to work with Linq</p> </blockquote> <p>Absolutely, since version 3.0 Linq is supported.</p> <p>For a comparisson between nhibernate, LinqToSql and subsonic read <a href="http://subsonicproject.com/docs/Comparisons" rel="nofollow noreferrer">this</a> It's actually a fair and up to date comparison and explicitly outlines the differences in the visions of the different ORM's.</p> <p>Things I miss in subsonic:</p> <ul> <li><p>UnitOfWork support (you could solve this by using the support for transactions.)</p></li> <li><p>IdentityMap support (your objects get cached in some scope (appdomain, threat, web request context, page lifetime, ...) Although you good argue if this is supposed to be part of the ORM, or of some caching layer.</p></li> </ul> <p>I heard hibernate supported both.</p>
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    1. POWhat ORM for .net should I use?
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    1. CONot every ORM is productive and/or database agnostic. Linq2Sql is very unproductive when you have a changing database schema, or if you want to forget to save or retrieve by yourself data from or to the database. Also, Linq2Sql only works with Sql Server, so it is not database agnostic at all.
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    2. COOn *"fair comparison"* : the author himself says *"I have never used NHibernate"*, the comparison itself is on subsonic.com, hardly a good starting point for being considered "fair" (I'm not saying it isn't fair, I'm just saying it looks different).
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    3. CO@Abel, actually admitting that is quite fair IMHO. The reason I explicitly mention "fair", is that when I read "author of x has a comparison with y, z, ..." I almost never go read it. Most of the time they are just highlighting their product. What is not the case with this comparison. He compares the fundamental differences in visions of the different ORM's, which is especially helpful if you are new to the ORM landscape.
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