As per i understand from your question you want to save Arabic values in a variable.
for that try this:
1. You can use Arabic collations
CREATE TABLE #testArabic
(
column1 nVARCHAR(100) COLLATE Arabic_CI_AI_KS_WS
)
OR
For the field to be able to store unicode characters, you have to use the type nvarchar or ntextor nchar.
To insert the unicode characters in the database you have to send the text as unicode by using a parameter type like nvarchar / SqlDbType.NVarChar from your coding side.