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private static String ReadPdf(String fileName)
{
Stream stream =new FileStream(fileName, FileMode.Open, FileAccess.Read);
Byte[] buffer = new Byte[stream.Length];
stream.Read(buffer,0,Convert.ToInt32(stream.Length));
StringBuilder sb = new StringBuilder();
CSequence sequence = ContentReader.ReadContent(buffer);
sb.Append(Encoding.Unicode.GetString(sequence.ToContent()));
return sb.ToString();
}