Index: src/Common/SharpMap/Data/Providers/DbaseReader.cs
===================================================================
diff -u -r8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9 -r0153333b695581ca406c286a27467bc30d7aa5f8
--- src/Common/SharpMap/Data/Providers/DbaseReader.cs	(.../DbaseReader.cs)	(revision 8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9)
+++ src/Common/SharpMap/Data/Providers/DbaseReader.cs	(.../DbaseReader.cs)	(revision 0153333b695581ca406c286a27467bc30d7aa5f8)
@@ -60,7 +60,7 @@
 
         protected bool Equals(ShapeFileFeature other)
         {
-            return Id == other.Id && Geometry.EqualsExact(other.Geometry);
+            return Geometry.EqualsExact(other.Geometry);
         }
 
         public override bool Equals(object obj)
@@ -74,9 +74,8 @@
         public override int GetHashCode()
         {
             int result = 17;
-            result = 37 * result + Id.GetHashCode();
             result = 37 * result + Geometry.GetHashCode();
-            
+
             return result;
         }
     }