=== modified file 'MySql.Data/Provider/Source/datareader.cs'
--- MySql.Data/Provider/Source/datareader.cs	2009-12-03 18:25:19 +0000
+++ MySql.Data/Provider/Source/datareader.cs	2010-02-04 08:07:15 +0000
@@ -269,11 +269,11 @@
 
 			IMySqlValue val = GetFieldValue(i, false);
 
-			if (!(val is MySqlBinary) && !(val is MySqlGuid))
+            if (!(val.MySqlDbType == MySqlDbType.Binary) && !(val.MySqlDbType == MySqlDbType.Guid))
 				throw new MySqlException("GetBytes can only be called on binary or guid columns");
 
             byte[] bytes = null;
-            if (val is MySqlBinary)
+            if (val.MySqlDbType == MySqlDbType.Binary)
                 bytes = ((MySqlBinary)val).Value;
             else
                 bytes = ((MySqlGuid)val).Bytes;