ASP.NET automatic memory management

ASP.NET uses the same system of automatic memory management as .NET, as a whole, does.

Namely, when there are no longer any references to an object, a garbage collector reclaims the memory the object was occupying on the heap.

Check out this article for more details:

http://www.c-sharpcorner.com/UploadFile/tkagarwal/MemoryManagementInNet11232005064832AM/MemoryManagementInNet.aspx