Multi threading use with entity framework save database

its a just example but i want some like this multi threading  increase perfomance

You mean to say that for 100 arrays you need to create 100 threads? If so, then I won't recommend this approach as too many threads instead of improving performance reduce the performance plus you will have integrity issue for threads. I appreciate if you can elaborate your problem a bit clear and in more detail so suitable solution could be provided I. E. Why you need so many threads at first place?

I have 100 arraylist want to save in database after save all files return all save Id's to calling function.