http://www.zwsoft.com/forum/viewthread.php?tid=2415 Hai 1.Is there is any samples available to make SQL Server Database connection using ZRX concept? If Yes means, Please send the code.It will more helps to bind our environment to ZWCAD. 2.Is there is any samples available for restriction of entities edition via ZRX? Better send the code with user guidelines. It most helpful to us Please Respond as soon as possible. sathiyanathan 2012-09-04 17:16:24 http://www.zwsoft.com/forum/viewthread.php?tid=2415&pid=15901 Tank you for your valuable suggestion.... sathiyanathan 2012-09-05 11:42:29 http://www.zwsoft.com/forum/viewthread.php?tid=2415&pid=15900 1. About connecting to SQL, you could use ADO. Please refer to this URL: [url=http://www.codeproject.com/Articles/1075/A-set-of-ADO-classes-version-2-20]http://www.codeproject.com/Articles/1075/A-set-of-ADO-classes-version-2-20[/url] 2. About protecting entities, we cannot give you a detail advise because it is complex and mostly depends on your demands. But one of the ways to achieve your goal is to make the entities as a block and make it un-explodable. peimen8012 2012-09-05 09:43:49