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StreamWriter swUtf8 = new StreamWriter("a.txt", false, Encoding.UTF8);
swUtf8.WriteLine("Hello, World!");
swUtf8.Close();
FileStream fs = new FileStream(path + ".txt", FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs,Encoding.UTF8);
FileStream fs;
fs = new FileStream(path + ".txt", FileMode.Append, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine("asd");
sw.Close();