Bishoy,
AFAIK you cannot change the language only for a particular text box. The
input language is defined on the level of the UI thread and it is controlled
by the Application.CurrentInputLanguage property.
What you can do is to track the text box focus and when the control gets the
focus change the Application.CurrentInputLanguage to Arabic.

Signature
HTH
Stoitcho Goutsev (100)
> Hi All,
>
[quoted text clipped - 7 lines]
> Thank you.
> Bishoy