Filter Datagrid View from on data populated by AddRow method

Question

Hello developers, I need help on this post i posted on stackoverflow which have strained for a whole week with it

https://stackoverflow.com/questions/63245000/filter-datagrid-view-from-data-populated-from-entity-in-c-sharp

 

My main problem is that I have designed my datagridview from designer and the example am getting seems to be filling columns from the code.