Localization :: Sending Email With Persian Language?

i have a webform that uses a master page and called Order.

i would send order information into my email. everything is ok but when i will send a message that has wrote in Persian Language the ? character will be sent instead of my characters. i set this code in some places :

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

but it was not practical.

this is my masterpage code :

[Code]....

and this is my order page code :

[Code]....