private string FindAscii(byte[] allBytes, int start, int end, int length)
{
for (int i = start; i < end; i++)
{
string testStr = System.Text.ASCIIEncoding.ASCII.GetString(allBytes, i, length);
testStr = StripNonAsciiCapital(testStr);
if (testStr.Length == length) return testStr;
}
return "";
}