title: How calculate checksum using 8-bit addition of all bytes in the data structure
body: <p>I need to calculate checksum from byte array. Its some serial port packet. I have just this text: </p>
  
  <p>Checksum is calculated using 8-bit addition of all bytes in the data structure.Overflows are not taken into account (1 byte).</p>
  
  <p>How do 8-bit addition?</p>
  
  <p>Need it in C#.</p>