Caching is a technique to save frequently used data into into temporary location. Improves application performance. Reduce a lot of server resources at peak times.

1. ASP.NET Caching
Presenter: Vikash Kumar, Mindfire Solutions

2. Agenda
●
Basics of ASP.NET Caching
●
Types of Caching
●
Output Caching
●
Full Page Caching
●
Partial (Fragment) Caching
●
Application (Object) Caching
●
System.Runtime.Caching
●
Custom cache providers
●
Some other caching techniques
●
Caching consideration

3. Basics of ASP.NET Caching
●
Caching is a technique to save frequently
used data into into temporary location.
●
Improves application performance.
●
Reduce a lot of server resources at peak
times.
●
Types of Caching
◦ Output Caching
●
Full Page Caching
●
Partial (Fragment caching)
◦ Application (Object) caching

4. Output Caching
●
Output caching enable to store rendered
HTML.
●
@ OutputCache directive is used to cache.
●
OutputCache attributes:
◦ Duration (time duration in seconds)
◦ VaryByParam (Cache by parameters)
◦ VaryByControl (Cache by controls)
◦ VaryByHeader (Cache by header Ex: User-Agent)
◦ VaryByCustom (GetVaryByCustomString on
Global.asax)

5. Output Caching...
●
OutputCache attributes:
◦ VaryByContentEncoding ( Ex: text/plain , text/html )
◦ Location
●
Server ( Output is saved under Web server memory )
●
Downstream ( Header is added to response to cache
on proxy server )
●
Client ( Header is added to response to cache on page
level )
●
Any ( Could be stored on any location ) - Default
●
None ( No caching is done )

6. Fragment Caching
●
Partial-page caching can work through user
control caching and post-cache substitution.
●
A portion of the page get cached.
●
Done through help of user controls or
substitution controls like AdRotator
●
Shared attribute is only available for user
control for sharing cache across multiple
pages.

7. Application/Object Caching
●
The application cache provides a
programmatic way for you to store arbitrary
data in memory using key/value pairs. Using
the application cache is like using application
state.
●
System.Web.Caching assembly
●
Depends upon HttpContext
●
Functions
◦ Cache.Insert
◦ Cache.Add

8. System.Runtime.Caching
●
System.Web.Caching.Cache is used with help
of System.Web.dll
●
New API came with .NET 4.0 under
System.Runtime.Caching.dll with
System.Runtime.Caching
●
It could be used in Win Forms, WPF etc
without making reference to System.Web.dll
●
The new API is based on in memory cache.
●
Write once and can be used in different .NET
technologies.

9. Custom Cache Provider
●
Output Caching are in memory.
●
Functionality came with ASP.NET 4.0
●
Implements OutputCacheProvider.
●
Add(), Get(), Set(), Remove() functions are
available for operation
●
Through custom cache provider cache could
be stored in File system, Cloud, database,
memory.
●
Helpful under scavenging process (removing
of cache when server memory is getting low).

10. Custom Cache Provider...
●
Output Caching are in memory.
●
Functionality came with ASP.NET 4.0
●
Implements OutputCacheProvider.
●
Add(), Get(), Set(), Remove() functions are
available for operation
●
Through custom cache provider cache could
be stored in File system, Cloud, database,
memory.
●
Helpful under scavenging process (removing
of cache when server memory is getting low).
Cache Provider
Add Get Set Remove
DB Files

11. Cache Provider
Add Get Set Remove
CloudDB Files
Custom Cache Provider...

12. Other techniques
●
Profile Caching under web.config to be
consistent with different setting.
●
GlobalOutputCacheProviderName in
Global.asax to change cache providers
according to need.
●
SQLCacheDependency has very limited
support and also depends upon SQL
configuration too.
http://blogs.msdn.com/b/tolong/archive/2007/02/16/sql-cache-dependency.aspx
http://www.codeproject.com/Articles/12335/Using-SqlDependency-for-
data-change-events

13. Caching Consideration
●
Full page caching: If page contents changes
after certain interval.
●
Fragment caching: Some of page contents
remains static but others are frequently
changes.
●
Object caching: Data is accessed frequently
and takes time to load up.
●
Cache dependency: File, Directory or based
on other cache entries.
●
Sliding or Absolute: Sliding, if data is not
changed frequently.

14. Question and
Answer

15. Thank you