Hello Bernhard
Thanks, it worked. I changed the datatype to nvarchar, and the field admit cyrillics chars. You made me understand the difference between varchar and nvarchar.
It seem i need also prefix with 'N' the value in my insert query. For exemple :
"insert into table (field) values (N'УНИКАЛЬНЫЙ')"
--> as i change my request i need to update server side code, so i'll take opportunity to change the way i store this data.
Before i do that, and for going fast without re-publishing my project, i just converted curillics characters into latins ones, via javascript (script of this
site). Dirty solution, i know, because yiddish or japaneses characters are not yet managed. But it work now for russians people, that's ok, thanks.