cheers bro!
Found it!!//From this
//output = sr.ReadToEnd().Replace("\x00", "");
//To this
output = sr.ReadToEnd().Replace("\x00", "").Replace("}{", "},{");
Yeah, it seems that there is an error in the JSON produced by cgminer. This is a workaround (hack) that I had to do in order to be able to parse the output !!!