You must set Request and Response encoding for your page/application to support UTF. Also, make sure that the datatype for the coulmn that store the data must be NVARCHAR(in case you are using MS-SQL Server). To set page level encoding add:
<![CDATA[<%@ Page ResponseEncoding="utf-8" RequestEncoding="utf-8"%>]]>
at the top of your page. And to set application level encoding add:
in your web.config file. Hope it helps.