Facing issue in expression while querying the data

For what purpose do you try to load the whole table into memory?

I Need to show all the data into Grid in UI

I would say show few columns in the grid by minimizing the amount of data that you query and try to have a summary where you can display the whole data of that particular selection. That would be a better option. If you have too many columns your grid would look clumsy anyway. So I would consider few points from Rohit's suggestion.

I would say show few columns in the grid by minimizing the amount of data that you query and try to have a summary where you can display the whole data of that particular selection. That would be a better option. If you have too many columns your grid would look clumsy anyway. So I would consider few points from Rohit's suggestion.