ReadExisting(); missing data?

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C#

Hi All,

I have an issue with some code I am writing for interfacing to a board. The device is connected to the PC via a USB cable and is emulating a Com port. I am using the ReadExisting() method to get the data back from this unit as follows

try
                  {
                      //InputData = myComPort.ReadTo(">");
                      InputData = myComPort.ReadExisting();
                      if (InputData != String.Empty)

This works most of the time occasionally I am seeing the odd bit of missing data from the end of a string most commonly the last string read in. I can't count the characters in as not all the data is the same length (the 5 digit serial numbers weren't long enough so they were altered, where in the doc updates does it say that? another rant!) the data does appear to terminate with a CR/LF (0D / 0A) so I should be able to use a ReadLine() but if I substitute ReadLine() or ReadTo(">") (as the board gives > as a prompt) for ReadExisting() nothing happens I am seeing in a Serial Monitor the data come back SN=09122005 0D 0A 3E to give
SN=09122055
>

I'm guessing that the 3E is throwing the ReadLine() as the 0D is follow 0A followed by 3E anybody any ideas, I am puzzled as to why the ReadTo(">") is not working ideas please!
Glenn
I have altered my code to allow ReadLine() to work, I have not yet had an issue of missing data. A solution or not?