C# 1256 file encoding

I am facing an encoding problem.
I want to write information to a file ( Arabic Letters ( windows-1256 ) ), but the letters are written in UTF-8 , here is the code :

FileStream afile = new FileStream ("school_db.sql", FileMode .OpenOrCreate);
StreamWriter sw = new StreamWriter (afile);
string test = "شكرا على المساعدة ";
sw.Close ();

So I want to convert the variable :' test' to windows-1265 befor writing it to the file.
Thank you for your help

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You are pointing at this?

System.Text.Encoding enc = System.Text.Encoding.GetEncoding(1256);
System.IO.StreamWriter sw = new System.IO.StreamWriter("c:\test", false, enc);

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ad-solAuthor Commented:
Yes, it is working now,
Thank you PockyMaster
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