Filter a data table based on a column in another data table

use your variablename whenever you see dtProds within the LINQ statement

use your variablename whenever you see dtList within the LINQ statement

d1,d2 are like local variable names referencing the looped datarows

Also have a look here:
:ambulance: :sos: [FirstAid] Handling of The source contains no DataRows exception - News / Tutorials - UiPath Community Forum

And here for LINQ
[HowTo] LINQ (VB.Net) Learning Catalogue - Help / Something Else - UiPath Community Forum