--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/DataAccess/PrimaryKeyAttribute.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,24 @@
+using System;
+
+namespace BLToolkit.DataAccess
+{
+	[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
+	public sealed class PrimaryKeyAttribute : Attribute
+	{
+		public PrimaryKeyAttribute()
+		{
+			_order = -1;
+		}
+
+		public PrimaryKeyAttribute(int order)
+		{
+			_order = order;
+		}
+
+		private readonly int _order;
+		public           int  Order
+		{
+			get { return _order; }
+		}
+	}
+}