Question

Change Image Inside UpdatePanel Dynamically

Asked by: sdugar

Hi Friends,

I'm generating an image (graph.jpg) runtime and saving it to the server and displaying it in a image control by setting its ImageUrl property. The Image control is inside an UpdatePanel.

The problem is that,

Image is displaying (with change) fine when EnableViewState=False, but not showing any changes when EnableViewState=True.

Please tell me the reason and provide a solution.

<asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional" >
 <ContentTemplate>
 
..................
..................
 
<asp:LinkButton ID="linkGraph" CssClass="submit" Width="150" runat="server" Text="CREATE GRAPH" OnClick="DisplayGraph"></asp:LinkButton>
 
<asp:Image ID="imgGraph" runat="server" ImageUrl="~/Images/graph.jpg" />
 
 
</ContentTemplate>
<Triggers>
 <asp:AsyncPostBackTrigger ControlID="linkGraph" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
 
 
 
protected void DisplayGraph(object sender, EventArgs e)
{
.................
.................
Graph.GraphToFile(Server.MapPath(hostName + "Images/" + "graph.jpg"));
 
}

                                  
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Asked On
2009-09-10 at 04:42:58ID24720958
Tags

asp.net

,

Ajax

,

UpdatePanel

,

Image

,

ViewState

,

Error

Topics

Asynchronous Javascript and XML (AJAX)

,

Web Development Software

,

Programming for ASP.NET

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: jotero25Posted on 2009-09-10 at 08:53:16ID: 25301437

Try changing the file name each time. The browser is probably caching the image.

 

by: sdugarPosted on 2009-09-10 at 21:48:12ID: 31627024

Thanks a lot.

 

by: sdugarPosted on 2009-09-10 at 21:53:50ID: 25306767

Hi jotero25,

Thanks for your valuable reply.

Your suggesion is helpfull and now it is working properly.

One more thing - Can i solve it by clearing caching image?

 

by: jotero25Posted on 2009-09-11 at 11:42:49ID: 25312309

Hi sdugar,

Clearing the caching image would probably work, but that is not a good solution since it is better to preserve the data that never change in cache to increase the solution performance.

20120131-EE-VQP-002

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