This lecture presents: Object relational Mapping (ORM) Caching Techniques includes output caching, fragment caching and data caching

1. ASP.NET 4.0
Julie Iskander
MSC. Communication and Electronics

2. Lecture Outlines
 Object relational Mapping (ORM)
 Caching

3. Object relational Mapping (ORM)
 Is a mechanism that makes it possible
to address and manipulate objects
without having to consider how these
objects relate to their data sources.
 Manages the mapping details between
a set of objects and underlying
Relation Database, XWL,……, or any
data store.

4. Object relational Mapping (ORM)

5. Convert from an HTML to an aspx page

6. Object relational Mapping (ORM)
Tools
 Types:
◦ Microsoft ORM
 Entity FrameWork
 LINQ
◦ Third-Party ORM
 ORM.Net
 NHibernate

7. Caching

8. Caching
 Storing an in-memory copy of expensive information .
 Better Performance because information retrieval time is cut down
dramatically.
 Better Scalability because more simultaneous page requests can
be served with fewer database operations
 May cause low memory
◦ slows down the entire system.
◦ To prevent this, ASP.NET remove objects when memory gets scarce.
◦ (Self-sufficiency)
 Can cache
◦ completely rendered HTML for a page,
◦ a portion of that HTML,
◦ arbitrary objects.

9. Types of Caching
 Output Caching
 Data Caching

10. Output Caching
Specific QueryString Parameters
Disadvantages:
wont’t work with user-specific
pages
won’t work with event-driven pages

11. Custom Output Caching

12. Fragment Caching
 Create a user control for the portion of
the page you want to cache.
 Add the OutputCache directive to the
user control.
 Cannot interact with the user-control in
code.
A block of HTML is simply inserted
into the page, user control object is
not available.

13. Other Caching techniques
 Post-Cache Substitution
◦ Pages 485-487 in Pro ASP.NET 4

14. Caching Configurations

15. Data Caching
 Add items that are expensive to create to a
special built-in collection object (called
Cache). This object works much like the
Application object.
 Globally available to all requests from all
clients in the application.
 Difference between Application and Cache
Objects:
◦ Items in the cache are removed automatically
 Always check if a cached object exists
before attempting to use it.
 Stored in process, and won’t persist if the
application domain is restarted.

16. Lab #7
 Finish previous labs
 Add caching to Bookie website as you
see appropriate.

17. REFERENCES
 [1] Beginning ASP.NET 4 In C# 2010, Matthew
Macdonald, Apress
 [2] Web Application Architecture Principles,
Protocols And Practices, Leon Shklar And Richard
Rosen, Wiley
 [3] Professional AS P.NE T 4 In C# And VB, Bill
Evjen, Scott Hanselman And Devin Rader, Wiley
 [4] Pro ASP.NET In C# 2010, Fourth
Edition,matthew Macdonald, Adam Freeman, And
Mario Szpuszta, Apress