Hi Rafat.
There is standard multilanguage support in WinForms (as well in WebForms).
Here you may find links to articles on the subject:
http://msdn2.microsoft.com/en-us/library/z68135h5(VS.71).aspx
In general, for WinForms application you have to set
Localizable property of the form to
true and the
Language property to the language you wish ("
Polish" should be in the drop-down for that property).
Note that new controls can be added only for forms with
Language set to "
(Default)". So, first you have to add the controls in the form and after that to set the language.