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Show / Hide Table of Contents
  • Programmer's Guide
  • Client Side API Programming
    • Setting Up Development Environment
    • Basic Cache Operations
      • Initialize Cache
      • Add Data to Cache
      • Update Data in Cache
      • Fetch Data From Cache
      • Remove Data From Cache
      • Dispose Cache
    • Bulk Operations
      • Adding Collection to Cache
      • Updating Collection in Cache
      • Retrieving Collection from Cache
      • Removing Collection from Cache
      • Deleting Collection from Cache
    • Asynchronous Operations
      • Using Asynchronous Operations
      • Using Asynchronous Operations with Callback Methods
    • Groups and Subgroups
      • Adding/Updating Data Group in Cache
      • Retrieving Data Group from Cache
      • Removing Data Group from Cache
    • Tagging Data in NCache
      • Creating Tags
      • Adding Items with Tags
      • Retrieving Previously Tagged Data
      • Removing Tagged Items from Cache
    • Named Tags
    • Data Expiration Strategies
      • Using Absolute Expiration
      • Using Sliding Expiration
    • Cache Dependencies
      • Key Dependency
      • File Dependency
      • Notification based Dependencies
        • Database Dependency using SQL Server
        • Database Dependency using Oracle
      • Polling Based Dependency
      • Custom Data Source Dependency
      • Multiple Cache Sync Dependency
      • Aggregate Dependency
      • Add Dependency to Existing Item
      • Using CLR Procedures to Call NCache
    • Locking Data in NCache
      • Locking Items in Cache (Pessimistic Locking)
      • Locking Items with Cache Item Versioning (Optimistic Locking)
    • SQL Reference for NCache
      • SQL Syntax
      • Querying Samples for Operators
      • Querying Data in NCache
      • NCache Language Integrated Query (LINQ)
        • Using LINQ in NCache
        • Configuring LINQPad for NCache
        • Querying NCache Data in LINQPad
    • Event Notifications
      • Cache Level Event Notifications
      • Item Level Event Notifications
      • Custom Event Notifications
    • Publish/Subscribe (Pub/Sub) in NCache
      • Pub/Sub Topics
      • Managing Topics
      • Pub/Sub Messages
        • Message Behavior and Properties
        • Creating a Message
      • Publish Messages to Topic
      • Subscribe for Topic Messages
      • Monitoring Pub/Sub Topics
    • Continuous Query
    • Using Streams in NCache
      • Opening with Stream Modes
      • Adding and Updating Data with Streams
      • Retrieving Data from Streams
      • Closing a Stream
    • Security and Encryption
      • NCache Security
      • NCache Data Encryption
    • Data Compression
    • NCache Management API
  • Server Side API Programming
    • Cache Startup Loader
      • Components of Cache Startup Loader
      • Sample Implementation of ICacheLoader on Single Node
      • Sample Implementation of ICacheLoader with Distribution Hints
    • Data Source Providers (Backing Source)
      • Read-Through Caching
        • Configure Read-Through Provider
        • Using Read-Through with Cache Operations
      • Write-Through Caching
        • Configuring Write-Through Provider
        • Using Write-Through with Basic Operations
        • Using Write-Behind with Basic Operations
        • Using Write-Behind with Bulk Operations
        • Using Write-Behind with Async Operations
        • Monitor Write-Through Counters
    • Custom Dependency
      • Sample Implementation of Custom Dependency
      • Sample Usage of Custom Dependency
    • WAN Replication through Bridge
      • Bridge Configurations
      • Implementing Bridge Conflict Resolver
    • Entry Processor
      • Sample Implementation of IEntryProcessor Interface
      • Sample Usage of EntryProcessor
    • MapReduce
      • Sample Implementation of MapReduce Interfaces
      • Sample Usage of MapReduce
    • Aggregator
      • Sample Implementation of IValueExtractor Interface
      • Sample Implementation of IAggregator Interface
      • Sample Usage of Aggregator
    • Dynamic Compact Serialization
  • Client Side ASP.NET Features
    • ASP.NET
      • ASP.NET Session State Provider for NCache
      • Multi-Region ASP.NET Session State Provider for NCache
    • ASP.NET Core
      • Session Storage in ASP.NET Core
        • Configure NCache ASP.NET Core Session Provider
        • Configure ASP.NET Core Sessions with NCache IDistributedCache Provider
      • Multi-Region ASP.NET Core Session Provider for NCache
      • Object Caching in ASP.NET Core
    • ASP.NET SignalR
      • Using NCache Extension for SignalR
    • View State Caching
      • Configuring and Using Content Optimization
      • Group View State with Sessions
      • Limit View State Caching
      • Perform Page Level Grouping for View State
    • ASP.NET Output Cache
      • Configure ASP.NET Output Caching
      • Using ASP.NET Output Cache with Custom Hooks
  • Client Side Third Party Integrations
    • Migrating AppFabric to NCache
      • AppFabric API vs. NCache API
    • NHibernate
      • NCache as NHibernate Second Level Cache
      • Using NHibernate Query Caching
      • Configuring Database Synchronization with NHibernate
    • Entity Framework Caching Integration
      • NCache as Entity Framework Second Level Cache
      • Entity Framework Caching Config File
    • Entity Framework Core Caching
      • Installing NCache Entity Framework Core Provider
      • Configuring NCache Entity Framework Core Provider
      • Using NCache Entity Framework Core Provider
        • Caching Options for EF Core Provider
        • LINQ APIs for EF Core Provider
        • Cache Only APIs for EF Core Provider
        • Query Deferred APIs for EF Core Provider
      • Logging in NCache Entity Framework Core Provider
    • Memcached
      • NCache Memcached Gateway Approach
      • Memcached Client Plugin for .NET
    • Debug NCache Providers in Visual Studio
    • NCache for Visual Studio Extension

ASP.NET Session State Provider for NCache

Storing ASP.NET sessions in NCache requires no programming. NCache Session State Provider is a custom SessionStateStoreProviderBase implementation for an ASP.NET application. In order to configure and fetch ASP.NET Sessions in your application, the following modifications are required:

Modify Assemblies Tag

Modify <assemblies> section in the application's Web.config and add following assembly.

Enterprise Edition:

<assemblies>
  <add assembly ="Alachisoft.NCache.SessionStoreProvider, Version=x.x.x.x,
Culture=neutral, PublicKeyToken=CFF5926ED6A53769"/>
</assemblies>

Community and Open Source Edition:

<assemblies>
  <add assembly ="Alachisoft.NCache.SessionStoreProvider, Version=x.x.x.x, Culture=neutral, PublicKeyToken=1448e8d1123e9096"/>
</assemblies>
Note
  • Replace Version=x.x.x.x with the actual NCache version that you have installed. For example, Version=4.9.0.0.

  • Refer Alachisoft.NCache.SessionStoreProvider in your project from %NCHOME%/bin/assembly/4.0.

Modify sessionState Tag

Edit your application's Web.config file and modify the <sessionState> section as given below.

<configuration>
  ...
  <sessionState cookieless="false"
                regenerateExpiredSessionId="true"
                mode="Custom"
                customProvider="NCacheSessionProvider"
                timeout="20">
    <providers>
      <add name="NCacheSessionProvider"
          type="Alachisoft.NCache.Web.SessionState.NSessionStoreProvider"
           cacheName="mySessionCache"
           sessionAppId="NCacheApp"
           exceptionsEnabled="true"
           writeExceptionsToEventLog="false"
           enableLogs="false"
           enableSessionLocking="true"
           sessionLockingRetry="-1"
           emptySessionWhenLocked="false" />       
    </providers>

  </sessionState>
...
</configuration>

Modify MachineKey Tag for Web Farms

In case of web farms, add <machineKey> entry under <system.web> section. It is required to generate ASP.NET session IDs in the same manner on all nodes.

Learn about how to generate a machine-key for a web farm:
Generate a Machine Key for a Web Farm (IIS 7)

<machineKey validationKey ="A01D6E0D1A5D2A22E0854CA612FE5C5EC4AECF24"
   decryptionKey ="ACD8EBF87C4C8937" validation ="SHA1"/>

Fetch Session Data

NCache allows viewing all session data stored in clustered cache via NCache Session State Module. All session data is added in the specified cache as a tagged cache item with tag: NC_ASP.net_session_data.

In order to retrieve previously stored session data, data can be fetched by GetByTag API, which returns Hashtable populated with session IDs and associated session data stored in the cache.

Hashtable allSessionData = cache.GetByTag(new  Alachisoft.NCache.Runtime.Caching.Tag("NC_ASP.net_session_data"));

SessionState Properties

Following is the description of different key-value pairs specified above:

Member Description
sessionAppId Optional string attribute. Specifies an identifier to make sure that session ID remains unique in case multiple applications are using the same cache. Application ID should be the same for an application in a web farm. If no app ID is specified, nothing will be concatenated with session ID.
cacheName Required String attribute. Specifies the name of the cache to be used for caching session. If no cache name is specified, a configuration exception will be thrown.
enableSessionLocking Optional Boolean attribute. If this flag is set, NCache Session Store Provider exclusively locks the session-store item for which multiple concurrent requests are made. The default is false.
sessionLockingRetry Optional Integer attribute. If enableSessionLocking is true and this integer is not less than 0, NCache Session Store Provider will return empty session after sessionLockingRetry, which specify the number of retries to acquire a lock. The default is -1.
writeExceptionsToEventLog Optional Boolean attribute. If this flag is set, all the exceptions from cache API are written to event logs. The default is false.
enableLogs Optional Boolean attribute. When this flag is set, store provider logs all error information. The log files are created in %NCHOME%/log-files/SessionStoreProvider. The default is false.
enableDetailLogs Optional Boolean attribute. When this flag is set, store provider logs all debugging information. The log files are created in %NCHOME%/log-files/SessionStoreProvider. The default is false.
exceptionsEnabled Optional Boolean attribute. Specifies whether exceptions from cache API are propagated to the page output. Setting this flag is especially helpful during development phase of application since exceptions provide more information about the specific causes of failure. The default is false.
operationRetry It specifies the number of times server will retry the operation, in case connection is lost with a server while an operation is executing. Its default is zero.
operationRetryInterval It specifies the time interval between each operation retry, in case connection is lost with the server. Its default value is zero.
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