chinese char displaying as ????

Question

Hi,
 
The problem is when iam inserting chinese or japanese text from text box into a mysql database table , its displaying as ????.. and i got the same problem while retriving the chinese text into winform grid.

But when iam inserting manually in database its working fine..

I feel the problem is with c# as it not support utf8 charset and i have to do some encoding .

Can any one help me on this.