Enable asp.net polling, DOT NET Programming

How to Enable ASP.NET polling?

All our database side is configured in order to get the SQL Cache working in the ASP.NET side we require to do some configuration in the web.config file.

The 2 attributes are require to set in the "web.config" file:-

  • Set the "Enabled" attribute to true to set the caching on.
  • Set the poll time attribute to the number of milliseconds between every poll

2415_asp.net polling.png

Figure :- Web.config file modifications for SQL cache

At last use the Cache dependency object in your ASP.NET code.

After that comes the final step to use our cache dependency with programmatic data caching,output caching  and data source control, .

For the programmatic data caching, we have to create a new SqlCacheDependency &  supply that to the Cache.Insert() process .  In the SqlCacheDependency constructor, you supply 2 strings. The first is the name of the database you defined in the element in the part of the web.config file e.g: Northwind. The second is the name of the linked table example: Products.

private static void CacheProductsList(List products) {SqlCacheDependency sqlDependency = new SqlCacheDependency("Northwind", "Products");

HttpContext.Current.Cache.Insert("ProductsList", products, sqlDependency, DateTime.Now.AddDays(1), Cache.NoSlidingExpiration);}

private static List GetCachedProductList()

{return HttpContext.Current.Cache["ProductsList"] as List;}

ClsProductItem is business class, and here we are trying to cache a list of ClsProductItem instead of DataSet or DataTable.

The following method is used by an ObjectDataSource Control to retrieve List of Products

 public static List GetProductsList(int catId, string sortBy)

{

//Try to Get Products List from the Cache

List products = GetCachedProductList();

if (products == null)

{

//Products List not in the cache, so query the Database layer

ClsProductsDB db = new ClsProductsDB(_connectionString);

DbDataReader reader = null;

products = new List(80);

if (catId > 0)

{

//Return Product List from the Data Layer

reader = db.GetProductsList(catId);

}

else {

//Return Product List from the Data Layer

reader = db.GetProductsList();

}

//Create List of Products -List if ClsProductItem-products = BuildProductsList(reader);

reader.Close();

//Add entry to products list in the Cache CacheProductsList(products); }

products.Sort(new ClsProductItemComparer(sortBy));

if (sortBy.Contains("DESC")) products.Reverse();

return products; }

To perform the same trick with output caching, you simply need to set the SqlDependency property with the database dependency name and the table name, separated by a colon:

<%@ OutputCache Duration="600" SqlDependency="Northwind:Products" VaryByParam="none" %>

The same technique works with the SqlDataSource and ObjectDataSource controls:

 

Posted Date: 9/21/2012 9:12:26 AM | Location : United States







Related Discussions:- Enable asp.net polling, Assignment Help, Ask Question on Enable asp.net polling, Get Answer, Expert's Help, Enable asp.net polling Discussions

Write discussion on Enable asp.net polling
Your posts are moderated
Related Questions
Program for Solution of Linear Equations - C# Program Hello, I've been trying so many codes for this but those codes didn't work well. Please write a Program for solving Linea

What is a class? A class explains all the attributes of objects, as well as the methods that execute the behavior of member objects. It is a comprehensive data type, which show

I want to develop a Windows 8.1 Application Project Description: Media Player App Development for Windows 8.1 platform with brilliant UI, flexible controls and easy to use.

How do I force the Dispose method to be called automatically, as clients can forget to call Dispose method? To Call the Dispose method in the Finalize method and in the Dispose

What is event bubbling? The Server controls such as  DataList, Datagrid,  Repeater can have another child controls inside them. For example the DataGrid can have combo box ins

cookieless="false" timeout="20" /> Above is sample session state mode specified for SQL SERVER.


What are major events in GLOBAL.ASAX file? The Global.asax file, which is derived from the HttpApplication class, maintains a pool of the HttpApplication objects, & assigns the

How do we configure "WebGarden"? The process model configured the "Web garden" settings in the "machine.config" or in the "Web.config" file. The configuration section is named

deploying a mysql vb offline desktop application in new system that doesnot have any server or database created