Send email with Arabic (Persian) text in email body in ASP.Net

Dear Experts,

I followed this link, it works fine with English Text.

http://www.aspsnippets.com/Articles/Create-and-send-HTML-Formatted-Emails-in-ASP.Net-using-C-and-VB.Net.aspx

My problem is when I am adding Arabic text to the message body it displays ???? format.

Please let me know how can I overcome this issue.

Thanks in advance.