How to use system.web.caching in asp.net?

@orpha 

To use the System.Web.Caching namespace in ASP.NET, follow these steps:

1. Add a reference to the System.Web assembly in your project.
2. Import the System.Web.Caching namespace at the top of your code file.
3. Use the Cache object to store and retrieve data in your ASP.NET application.

Here is an example of how to add an item to the cache:

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// Add an item to the cache with a unique key and a specified expiration time
Cache["MyKey"] = "MyValue";
Cache.Insert("MyKey", "MyValue", null, DateTime.Now.AddMinutes(5), TimeSpan.Zero);

And here is an example of how to retrieve an item from the cache:

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// Retrieve an item from the cache using its key
string myValue = Cache["MyKey"] as string;
if (myValue != null)
{
    // Do something with the cached value
    Console.WriteLine(myValue);
}

You can also use cache dependencies to automatically invalidate cached items when a specified file or key changes. Additionally, you can set up cache expiration policies to automatically remove items from the cache after a certain period of time.

Overall, the System.Web.Caching namespace in ASP.NET provides a powerful way to store and retrieve data in memory efficiently, improving the performance of your web application.