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Posted 5 Mar 2012

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How to Solve Image Refresh Problem Associated with Image Control in ASP.NET

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7 Mar 2012CPOL2 min read
How to Solve Image Refresh problem associated with Image control in ASP.NET


This is a small tip on how to solve the Image refresh problem of Image control in ASP.NET.


Many a times, I have observed that:

  1. (PREREQUISITE) I have an Image control on my page.
  2. (STEP) I am uploading an image to be displayed on that control using Fileupload control.
  3. (STEP) I upload an image and it gets displayed in Image control.
  4. (STEP) If I upload another image (no post-back in between and after a very short file)
  5. (PROBLEM) Many times, the new image file gets uploaded on the server, but the image control could not show the new Image.

Using the Code

The problem seems to occur when I am saving the uploaded image in some predefined file name. So first time the Image control recognized that the file is new, the next time since the file-name is the same, but actually the image is different, the Image control chooses not to refresh itself as it keeps thinking that the same file is getting attached to it again. (Perhaps this is some optimization mechanism inside.)

To avoid such problem in the scenario, I tried to cheat the image control every time I upload a new image file. I attach a dummy query string parameter with the image URL which makes the Image control reconsider and shows the new Image instead.

Since this is one scenario, I found this problem there could be other scenarios too so I made a habit of using the image control in the following manner:

imgphoto.ImageUrl = path + "?time="+ DateTime.Now.ToString(); 

This ensures that the Image control always displays the latest uploaded image and there will never be a scenario when the file saved on server is different from the image that is being displayed.

Points of Interest

I still am curious about why this happened in the first place. What I could make out of it is that it is some sort of optimization mechanism that is preventing unnecessary calls when then Image control's attached file path and newly supplied file path is same. Perhaps some gurus can confirm.


  • 5th March, 2012: A simple solution based on dummy query string posted


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Rahul Rajat Singh
India India

I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.

  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4

If you like my articles, please visit my website for more:[^]

  • Microsoft MVP 2015

Comments and Discussions

GeneralUseful solution Pin
iratus711-May-14 12:24
Memberiratus711-May-14 12:24 
GeneralMy vote of 5 Pin
prashant patil 49871-Jan-14 17:34
Memberprashant patil 49871-Jan-14 17:34 
Answerimage Pin
shaikhshafique8-Mar-12 19:44
Membershaikhshafique8-Mar-12 19:44 
QuestionI have noticed this 'optimisation' bug(?) as well. Pin
Michael Kingsford Gray6-Mar-12 19:19
MemberMichael Kingsford Gray6-Mar-12 19:19 

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