asp.net mvc - don't show arabic symbols -

i use asp.net mvc 4 + entity framework 4 + ms sql 2008 r2. field has nvarchar(max) type.

i see, user enters arabic symbols:

but on page see "?" instead of arabic symbols:

russian symbols displays correctly. how solve problem? thanks

found strange string inside method:

this.response.contentencoding =

system.text.encoding.getencoding(thread.currentthread.currentculture.textinfo.ansicodepage); 

removed , works fine