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    <p>This seems to be just the cost of child AppDomains. A <a href="http://blogs.msdn.com/b/cbrumme/archive/2003/06/01/51466.aspx" rel="nofollow">rather ancient post</a> (which may no longer be relevant) suggests that there could be other considerations outside of just having to JIT-compile each child AppDomain, e.g. evaluating security policies.</p> <p>Entity Framework does have a relatively high startup cost so the effects are magnified, but for comparision calling other parts of System.Data (e.g. a straight <code>SqlDataReader</code>) is just as horrible:</p> <pre> EF.vshost.exe|0|SqlDataReader: 67 EF.vshost.exe|1|SqlDataReader: 0 EF.vshost.exe|2|SqlDataReader: 0 AppDomain0|0|SqlDataReader: 313 AppDomain0|1|SqlDataReader: 2 AppDomain0|2|SqlDataReader: 0 AppDomain1|0|SqlDataReader: 290 AppDomain1|1|SqlDataReader: 3 AppDomain1|2|SqlDataReader: 0 AppDomain2|0|SqlDataReader: 316 AppDomain2|1|SqlDataReader: 2 AppDomain2|2|SqlDataReader: 0 </pre> <pre><code>public class SamplePlugin : MarshalByRefObject, IPlugin { public void Do(int i) { var watch = Stopwatch.StartNew(); using (var connection = new SqlConnection("Data Source=.\\sqlexpress;Initial Catalog=EF.Plugin.MyContext;Integrated Security=true")) { var command = new SqlCommand("SELECT * from Posts;", connection); connection.Open(); var reader = command.ExecuteReader(); reader.Close(); } watch.Stop(); Console.WriteLine(AppDomain.CurrentDomain.FriendlyName + "|" + i + "|SqlDataReader: " + watch.ElapsedMilliseconds); } } </code></pre> <p>Even newing up a humble <code>DataTable</code> is inflated:</p> <pre> EF.vshost.exe|0|DataTable: 0 EF.vshost.exe|1|DataTable: 0 EF.vshost.exe|2|DataTable: 0 AppDomain0|0|DataTable: 12 AppDomain0|1|DataTable: 0 AppDomain0|2|DataTable: 0 AppDomain1|0|DataTable: 11 AppDomain1|1|DataTable: 0 AppDomain1|2|DataTable: 0 AppDomain2|0|DataTable: 10 AppDomain2|1|DataTable: 0 AppDomain2|2|DataTable: 0 </pre> <pre><code>public class SamplePlugin : MarshalByRefObject, IPlugin { public void Do(int i) { var watch = Stopwatch.StartNew(); var table = new DataTable(""); watch.Stop(); Console.WriteLine(AppDomain.CurrentDomain.FriendlyName + "|" + i + "|DataTable: " + watch.ElapsedMilliseconds); } } </code></pre>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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