The lines of data you have shown are not 94 characters per line.If you concatenate the first two, it is 95.
Check your inputs.
1) Don't use "magic numbers" - 94 is one in your code. Why is it 94? Answer: because that is the data size. So use a constant, and call it "dataSize" of similar. That way, if the data size changes, you only have to change it in one place.
2) If you are working with line-based data, then read it as lines:
string[] lines = File.ReadAllLines(openFileDialog1.FileName);
Will read your whole file, without worrying about streams, and place each line into a separate string, removing the \r and \n for you. You can then process each group of data separately, and report errors for individual "bad lines". You should not faff about with line terminators: they are not the same for all systems. The system you are working on knows what lines end with - use it!