How to serialize and compress an object to FileStream?

How to serialize and compress an object to FileStream?: "try 
    { 
        FileStream fs = new FileStream(@"C:\Projects\Test\Test.txt", FileMode.Open); 
        GZipStream decompressor = new GZipStream(fs, CompressionMode.Decompress); 
        BinaryFormatter bf = new BinaryFormatter(); 
        CUnits ds = (CUnits)bf.Deserialize(decompressor); 
        decompressor.Close(); 
        fs.Close(); 
    } 
    catch (Exception ex) 
    { 
        MessageBox.Show(ex.Message); 
    } "



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