ASP.NET View State Content Optimization Configuration

Pre-Requisites

To utilize ASP.NET View State Content Optimization with NCache in your application, install the AspNet.ViewState.NCache (Enterprise/ Professional) NuGet package by executing the following command in the Package Manager Console:

Enterprise:

Install-Package AspNet.ViewState.NCache

Professional:

Install-Package AspNet.ViewState.NCache.Professional

Configure View State Content Optimization

The following steps need to be performed in order to use content optimization feature of NCache with View State:

Step 1: Configure App_Browser File

Create an App_browser file in the ASP.NET application. It will be created under the directory of App_browsers.
Now plug page adapters in the app_browser file as following:

<browsers>
<!-- NCache Plug page adapters in the app browser file as following:. -->
   <browser refID="Default">
     <controlAdapters>
       <adapter controlType="System.Web.UI.Page"
       adapterType="Alachisoft.NCache.Adapters.PageAdapter">
     </controlAdapters>
   </browser>
</browsers>

Step 2: Configure Web.config File

<configSections>
    <sectionGroup name="ncContentOptimization">

      <section name= "settings"
               type="Alachisoft.NCache.ContentOptimization.Configurations.ContentSettings"
               allowLocation="true"
               allowDefinition= "Everywhere">
    </sectionGroup>
</configSections>

Specify the settings for the registered config section:

<ncContentOptimization>
   <settings enableViewstateCaching="true"
            viewstateThreshold="1"
            cacheUriMapping="true"
            enableTrace="false" 
            enableMinification="true" >

      <cacheSettings cacheName="demoClusteredCache" connectionRetryInterval="300">
            <expiration type="Absolute" duration="1" />
      </cacheSettings>

   </settings>
</ncContentOptimization>

Configuration Members

Member	Description
`enableViewstateCaching`	Boolean value to enable /disable the View State caching.
`viewstateThreshold`	Sets the minimum threshold size of `viewstate` in bytes. `Viewstates` which are smaller than threshold value will not be cached.
`cacheUriMapping`	Cache URL mapping, Default is true.
`enableTrace`	Enable/disable traces.
`cacheName`	Name of the Cache.
`connectionRetyInterval`	Retry Connection to Cache interval. Default is 300 seconds.
`Expiration`	Sets the expiration type which can either be `Sliding`, `Absolute` or `None`. And also expiration interval in minutes.
`Duration`	Sets expiration interval in minutes.

Fetch View State Data

If the same cache is being used for View State caching and other data, View State data can be retrieved by NC_ASP.net_viewstate_data tag. With this tag it is easy to find the data specific to View State.

Hashtable allViewStateData = cache.GetByTag(new Tag("NC_ASP.net_viewstate_data"));

The viewstate of a particular session can easily be retrieved from cache based on sessionId.