We can't tell you.
We don't have a "TMP36 Temperature sensor" and we have no idea how it is connected to your board - so we can't even begin to tell you how to read values. We can guess that it's connected via USB so will appear to C# as a serial port - in which case you need to look at the
SerialPort class[
^] - but other than that we can have no idea.
You should talk to the people who created it - they should provide technical support and will know more about their product than we will. If they don't, then find another supplier and demand your money back!