SharePoint visual webparts for NewForm with client side coding

I need to use visual web parts to create a new item form for a list. I know I can do this by using SSOM.. But I want to reduce the load on the server Can I use CSOM?.. Or is CSOM mainly for sandbox solution? Right now I am trying to write JavaScript code on ascx page but I am having issues with client context Please let me know if you have better ideas. I am working with sp2010 visual web parts. I do not want to use SharePoint designer and infopath Thanks in advance...