Question: how to get row value from datatable in uipath?
Answer: Step 4.1: Drag “Get Row Item” activity and supply the desired fields to it. Ex: The DataRow Object. The Column Name. Step 4.2: ... 
Step 4.2: Drag “Message Box” activity to display the above-fetched value.
Step 4.3: Similarly, try doing it for another column available i.e. “ID”