Head over to the code samples
page, select C# and the TMP1101 from the drop down menus, and then check all four thermocouple input boxes. This should give you a starting point to work from.
You can check the "separate event handlers" box if you want each thermocouple to be treated differently, or you can keep them all with the same change handler but use the "sender" parameter to tell which channel sent the event. See this page
for more details.