Image to Bitmap Quality Lose!!

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C#

hey all
i am work on windows mobile app.. that work as client and pc as server using WCF service and when i converte the Image on my PC to byte[]
to be able to transfer and it is work fine but when i accept the byte[] on mobile the quality veery ppooor i using
i using this code in mobile application

byte[] a = imagefromserver();
MemoryStream ms = new MemoryStream(a);
Bitmap b = new Bitmap(ms);
picturebox1.image=b;

how can i retrive the quilty of the orignal picture stored in PC !!

thxxxxxxx