[Solved] How to clear cache in browser back button in ASP.Net

I am inserting and updating the image from html file upload to my gridview / insertion goes fine , but when i update the image by clicking on edit using onselectedindexchanged event of gridview , i fetch the image then change it with other image , with this simultaneously i rebind the gridview , in the beck-end everything goes fine it updates and replaces the image but in gridview it won't show after updated . i am using postbacktrigger on my submit button, but gridview won't refreshes , until and unless i click on address bar and press ENTER , or until i won't press CTRL+F5 to clear the browser cache.