How to force clear cache in asp.net

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C#

ASP.NET

How to force clear cache in asp.net

Posted 19-Dec-11 0:09am

Mico Perez

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Anuj Banka · Answer 1 · 2011-12-19T00:15:00

Solution 1

C#

Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 Response.Cache.SetNoStore();

Put this code in page load. Now there will be no data in cache browser will try to get the page from the serv

Posted 19-Dec-11 0:15am

Anuj Banka

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Member 13603097 1-Feb-18 8:07am

its not working

Mico Perez · Answer 2 · 2011-12-19T00:16:00

i try this but it seems not working

public void DisablePageCaching()
{
//Used for disabling page caching
HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
HttpContext.Current.Response.Cache.SetValidUntilExpires(false);
HttpContext.Current.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.Cache.SetNoStore();
HttpContext.Current.Response.Cache.SetExpires(DateTime.Now.AddSeconds(-1));
}

private void ClearCache()
{
DictionaryEntry entry = default(DictionaryEntry);
foreach (DictionaryEntry entry_loopVariable in System.Web.HttpContext.Current.Cache)
{
entry = entry_loopVariable;
System.Web.HttpContext.Current.Cache.Remove(entry.Key.ToString());
}

IDictionaryEnumerator enumerator = HttpContext.Current.Cache.GetEnumerator();

while (enumerator.MoveNext())
{
HttpContext.Current.Cache.Remove(enumerator.Key.ToString());
}
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.Expires = 0;
HttpContext.Current.Response.CacheControl = "no-cache";
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.ServerAndNoCache);
HttpContext.Current.Response.Cache.SetNoStore();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ExpiresAbsolute =DateTime.Now.Subtract(new TimeSpan(1,0,0,0));
HttpContext.Current.Response.AppendHeader("Pragma", "no-cache");
HttpContext.Current.Response.AppendHeader("", "");
HttpContext.Current.Response.AppendHeader("Cache-Control", "no-cache"); //HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "private"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "no-store"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "must-revalidate"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "max-stale=0"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "post-check=0"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Cache-Control", "pre-check=0"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Pragma", "no-cache"); // HTTP 1.1
HttpContext.Current.Response.AppendHeader("Keep-Alive", "timeout=3, max=993"); // HTTP 1.1
}

Sanjay Kumar Dwivedi · Answer 3 · 2014-07-17T04:45:00

Solution 7

If you want set clear cache of current page then write below code on button click as well as on page load, It will work for me.

HttpResponse.RemoveOutputCacheItem("/pagecontentdetail.aspx")

Posted 17-Jul-14 4:45am

Sanjay Kumar Dwivedi

Comments

Dave Kreskowiak 17-Jul-14 13:03pm

Why are you responding to 3 year old questions?? DON'T!

copa017 26-Sep-19 7:50am

Why not responding to 3 year old question Dave???
People like me come here by googling this problem (it is one of the 1st search results), so it is very useful to have updated answers - and they are not only for the T.O..

Dave Kreskowiak 26-Sep-19 8:12am

Because what is appropriate for one version of ASP.NET may not be appropriate for newer versions.

Also, this answer doesn't give you any control over the caching policy. Instead, it's a "one shot kill" for the entire page. What's more common is to cache the page, but not certain items on the page, like data grids.

devildx2050 · Answer 4 · 2011-12-19T00:29:00

Morgs Morgan · Answer 5 · 2011-12-19T00:56:00

Try:

1. Set cache

C#

Cache[ "username" ] = "username";
Cache[ "password" ] = "password";

2. Use cache

C#

if( Cache[ "username" ] != null && Cache[ "password" ] != null )
{
   //cache is still alive
   String username = Cache[ "username" ].ToString();
   String password= Cache[ "password" ].ToString();
}
else
{
   //show error, cache objects do not exist!
}

3. Clear cache

C#

Cache[ "username" ] = null;
Cache[ "password" ] = null;

Happy coding,
Morgs

mikecran · Answer 6 · 2013-05-09T07:36:00

Try:

1. Set cache
Cache[ "username" ] = "username";
Cache[ "password" ] = "password";

2. Use cache
if( Cache[ "username" ] != null && Cache[ "password" ] != null )
{
//cache is still alive
String username = Cache[ "username" ].ToString();
String password= Cache[ "password" ].ToString();
}
else
{
//show error, cache objects do not exist!
}

3. Clear cache
Cache.Remove("username");
Cache.Remove("password");

How to force clear cache in asp.net

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