Boyan,
Apology but instead of replying in this post i ended up creating new post related to this issue. You can delete this post and follow on this issue instead:
http://www.telerik.com/forums/dropdownlist-reverts-back-to-'null'-value-after-selection-is-moved-in-the-grid-asp-mvc-5
Note: You can find CreateASNRequestViewModel in that post.
Thanks.