let us share some information resources with you, so you explore for training purpose
as you want to update a datacolumn value - find the right fitting approach
Get an intro to LINQ
see what can be done with LINQ
get access to the official docu
Now, the main building blocks are cleared and you can start with the implementation once you decided for the best fitting approach.
We would not recommend to use LINQ-Invoke Code constructs as long there is strong reason for this. As we can use other options as well