how to clear browser cache in asp.net/javascript?

In my program i need to handle with many images.I have to change images dynamically within the page. after change the images i need to refresh the page by clear browser cache.

is ther开发者_Python百科e any method to clear cache or event for getting ctrl+f5 or ctrl+shift+del event in javascript or c# by a separate refresh button click. Here I cannot use browser refresh button.

No. You can set expiration time to zero, but this can be overridden in browser preferences.

If you really need that the browser don't cache image, generate a random number and place it in the url

you cannot clear browser cache.the only idea is declare a session variable in c# code in page load and set its value is 1 at the very first time

if (!IsPostBack)
            {
Session["refresh"]="1"
}

you will need to set session variable in image upload button event Session["refresh"]="1" then create a refresh button .in the button event do the following thats all.after completeing your upload,click on the refresh button.then it work as ctrl+f5 button.if you not set the session value 0 in refresh button event the last event is again takesplace.if you enter a value in database,the same task takesplace if you not set session variable 0.

   if(Session["refresh"].ToString()=="1")
   {
      Response.Write("<script type='text/javascript'>locaton.reload()</script>");
      Session["refresh"]="0";
    }