--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HowTo/DataAccess/PrimaryKey.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,34 @@
+using System;
+
+using NUnit.Framework;
+
+using BLToolkit.DataAccess;
+using BLToolkit.Mapping;
+
+namespace HowTo.DataAccess
+{
+	[TestFixture]
+	public class PrimaryKey
+	{
+		public class Person
+		{
+			[MapField("PersonID"), /*[a]*/PrimaryKey/*[/a]*/, NonUpdatable]
+			public int    ID;
+
+			public string LastName;
+			public string FirstName;
+			public string MiddleName;
+		}
+
+		[Test]
+		public void Test()
+		{
+			SqlQuery<Person> da = new SqlQuery<Person>();
+
+			Person person = da./*[a]*/SelectByKey(1)/*[/a]*/;
+
+			Assert.IsNotNull(person);
+		}
+	}
+}
+