[.NET] Brauche Hilfe bei SevZip

using SevenZip.Compression.LZMA;
private static void CompressFileLZMA(string inFile, string outFile)
{
 SevenZip.Compression.LZMA.Encoder coder = new SevenZip.Compression.LZMA.Encoder();

 using (FileStream input = new FileStream(inFile, FileMode.Open))
 {
 using (FileStream output = new FileStream(outFile, FileMode.Create))
 {
 coder.Code(input, output, -1, -1, null);
 output.Flush();
 }
 }
}