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    <p>My suggestion is to check out the tutorials of a few ORMs, and then go with whichever works best for you.</p> <p>The NHibernate <a href="http://nhforge.org/doc/nh/en/index.html#quickstart-intro" rel="nofollow noreferrer">reference documentation</a> suggests 30mins to get the example in the introduction chapter up and running.</p> <p>My own ORM short list would be:</p> <ul> <li>NHibernate</li> <li>Linq 2 SQL</li> </ul> <p>Some related questions:</p> <ul> <li><a href="https://stackoverflow.com/questions/3505/what-are-you-favorite-net-orms">What are your favorite .NET Object Relational Mappers (ORM)?</a></li> <li><a href="https://stackoverflow.com/questions/812081/which-net-object-relational-mapper-is-fastest">Which .NET Object Relational Mapper is fastest?</a></li> <li><a href="https://stackoverflow.com/questions/146087/best-performing-orm-for-net">Best Performing ORM for .NET</a></li> <li><a href="https://stackoverflow.com/questions/467620/what-are-the-differences-and-pros-and-cons-of-these-orm-tools-technologies">What are the differences and pros and cons of these ORM tools/technologies?</a></li> </ul> <p><strong>NHibernate Example</strong> </p> <pre><code>// create and save an entity var u = new User{ Name="foo", SignupDate=DateTime.Now }; session.Save( u ); // fetch and update entity, saving a related entity var post = session.Get&lt;Post&gt;( 42 ); post.Tags["foo"].Count++; session.Save( post ); // save a related item for an entity post.Tags.Add( new Tag("Name")); session.Save( post ); </code></pre> <p>Some example mappings and classes:</p> <pre><code>public class User { public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual DateTime SignupDate { get; set; } } public class Post { public virtual int Id { get; set; } public virtual User User { get; set; } public virtual string Title { get; set; } public virtual string Body { get; set; } public virtual IList&lt;Tag&gt; Tags { get; set; } } public class Tag { public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual string Count { get; set; } } &lt;class name="User" table="user"&gt; &lt;id name="Id"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="Name" /&gt; &lt;property name="SignupDate" /&gt; &lt;/class&gt; &lt;class name="Post" table="post"&gt; &lt;id name="Id"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="Title" /&gt; &lt;property name="Body" type="StringCLob" /&gt; &lt;!-- ntext --&gt; &lt;many-to-one name="User" /&gt; &lt;bag name="Tags" table="post_tag" cascade="save-update"&gt; &lt;key column="postid" /&gt; &lt;many-to-many class="Tag" column="tagid" /&gt; &lt;/bag&gt; &lt;/class&gt; &lt;class name="Tag" table="tag"&gt; &lt;id name="Id"&gt; &lt;generator class="native" /&gt; &lt;/id&gt; &lt;property name="Name" /&gt; &lt;property name="Count" /&gt; &lt;/class&gt; </code></pre>
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    1. POWhat SQL ORM may i use to replace this old code
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    1. CO+1 but i would like to say IIRC both in your short list takes time to get up and running? and i am mostly worried no ORM allows you to write a plain simple class and insert it
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    2. CODo i need the maping for the first example to work?
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    3. COYes. The mapping would need to be en embedded resource in your class library.
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