What is the best way to store numbers in C#?

Question

Search Engine Optimization

Now there is such a scheme:
1) Numbers are taken from the database and stored in the string variable
2) Other queries are executed (Update, Insert)
3) Numbers are displayed on the screen.
In general, this works for more than one year. But recently, one person told me that I need to convert all numbers to int, since they take up less space.
The numbers are mostly positive from 10,000,000 to 1,000,000,000.
Which is more profitable:
1) store intermediate data as strings.
2) store in int, but always do Int32.Parse (int) and +
These are small things, but I want to do it right.

Answer 1

Fuck it, this is unnecessary bullshit. After all the optimizations, you will win 1kb of memory, which will be more than covered by uncollected garbage.