Not sure why this doesn't work. ascVal contains the character
from the substring.

Here's my code:

for(int iChar = 1; iChar < sTime.Length; iChar++)
{
  sChar = sTime.Substring(iChar - 1, 1);

  byte ascVal = System.Convert.ToByte(sChar);

  // Allowable values are 0-9,';','A','M','P'
  if ((iValue >= 48 && iValue <= 57) ||
    iValue == 58 ||
    iValue == 59 ||
    iValue == 77 ||
    iValue == 80)
  {
  }
  else
    bValid = false;

}

>>I am extracting characters from a string.
>>
>>How can I determine the ASCII value of the characters?
>>
>>Thanks
>
>byte ascVal = System.Convert.ToByte(char);
>
>Cetin