C# .NET - insert bengali script in html text field

I want to insert bengali text in html text field....unicoded....how to do? Please help

Use the Google or Microsoft  transliteration bookmarklets -
http://t13n.googlecode.com/svn/trunk/blet/docs/help_bn.html
http://specials.msn.co.in/ilit/Bengali.aspx

By dragging a bookmarklet onto the Bookmarks bar (or Link Toolbar in IE) & clicking on it to activate  transliteration, you can transliterate from English to Bengali. To disable transliteration, click on the bookmarklet again.

You can also the Google Transliteration Extension for Firefox 3.0 & above to input transliteration into textareas and text fields - https://addons.mozilla.org/en-US/firefox/addon/8960

Also check this related link - http://mvark.blogspot.com/2009/12/how-to-gmail-chat-in-indian-language.html