Calculate checksum for Laboratory Information System (LIS) frames

Question

I\'m developing an instrument driver for a Laboratory Information System. I want to know how to calculate the checksum of a frame.

Explanation of the checksum algorit

Answer 1

You can do this in one line:

return Encoding.ASCII.GetBytes(dataToCalculate).Aggregate((r, n) => r += n).ToString("X2");

Answer 2

private bool CheckChecksum(string data)
{
   bool isValid =false

   byte[] byteToCalculate = Encoding.ASCII.GetBytes(dataToCalculate);
   int checkSum = 0;
   for ( int i=i i<byteToCalculate.Length;i++)
   {
      checkSum += byteToCalculate[i];
   }
   checksum &= 0xff;

  if (checksum == byteToCalculate[ChecksumPlace]
  {
   return true
  }
  else
  {
  return  false
  }
}

Answer 3

Finally I got answer, here is the code for calculating checksum:

private string CalculateChecksum(string dataToCalculate)
{
    byte[] byteToCalculate = Encoding.ASCII.GetBytes(dataToCalculate);
    int checksum = 0;
    foreach (byte chData in byteToCalculate)
    {
        checksum += chData;
    }
    checksum &= 0xff;
    return checksum.ToString("X2");
}