When clicking button in debug mode, the page reloads but the break points inside of the click event are never reached. However, breakpoints in the page_load work just fine.
Basically, it's as if code inside of the button's click event is not being executed.
I checked the site into source control and another developer tried it on his computer. The click events worked just fine there, catching the break points inside.
I tried another site on my computer and it has the same issue. So it's something specific to my computer, and not specific to any site.
Is there some setting I may have mistakenly changed that could cause click events to stop working while debugging?
Any help would be appreciated.
Edited:
This issue is happening on all sites I run in my debugger, and the buttons are not created dynamically.
Edited:
There are no indication of problems when adding the break points. I don't think it's a breakpoint issue, I believe it's an issue with click events not firing. I put identical code on another developers machine and the click event's worked fine while debugging on that machine.
If its something specific to your machine, and after all things fail, I would do a repair on Visual Studio. I've had to do that a couple times when things get weird and it usually works. But remember to exhaust all other avenues first.
How is the button created? If it's added to the page dynamically, remember that this must be done before the load event, or the events won't be wired up. That is the most common reason I've heard for this kind of thing.
Does it say that "symbols will not be loaded" OR "source file is different" when you put the breakpoint inside the button_click event?
If so, you have modified the code files & built the binary (which is different from what site is using).
In my Page_Load event I would check the IsPostBack property to make sure that it is actually a post and not get. I would verify that the Controls collection is populated and all control IDs match those in the Request.Forms.Keys.
The reason for this suggestion is that if you have any add-on in the browser or fancy proxy that messes up with submitted forms and input names are modified, events won't fire for those controls.
I'll take a stab as I remember something similar:
I had upgraded an app from vs2005 to vs2008 and my button code click worked in 2005, but in 2008 I needed to add a "Handles" qualifier at the end of the declaration like this:
Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSave.Click
for whatever reason the 2005 code didn't need it, but the 2008 required it, and I vaguely remember having the very same symptoms you are describing.
So it seems all the click events I was testing were image buttons, and I didn't have the images on my local machine. For some reason, when the image was missing, the click event wouldn't fire.
Related
Can anyone tell me how to debug the code while running so that to see which server side method is being called? There are Custom methods in the code which are converted to Dll and i want to find what is happening. Also the method called on Button click is not doing any validtion, but there is coupon validtion happening on button click. also there is no javascript for this, since i disabled javascript and run the code and the validations run fine.
The button declaration:
<asp:Button ID="Apply" runat="server onClick = "Apply_Click" .. >
The click event:
Apply_Click(object sender, EventArgs e)
{
GetXML();
}
This just generates the XML but calls no other method. So now i have to find which server method is causing the server validation. Please can anyone help.
I am guessing that you have Visual Studio 2010 Pro (correct me if I'm wrong). Once your page is running, go into Visual Studio, click the pause button, then the step-into button. Now, when you click anything on the page (that sends the page server-side), VStudio will immediately kick-in, already paused.
You might also want to put break points on the blocks of code that you think are running. Then you can check your stack trace to see what path was taken to get there.
There are also ways of setting break-points on variables (watch) so VStudio will break whenever that value has changed. I think that feature is only available in Pro or Ultimate.
I having an issue with the ASP.NET Treeview control. I create the treeview just fine but the nodes will not expand or collapse. I see there is a javascript error but it is for line 1 character 0 of the webpage, there is nothing at line 1 character 0.
I am using the ASP:Treeview control in conjunction with the Telerik controls, but I'm not sure if that is an issue.
I saw there was a similar question here but the answer is not pertinent to my site. Has anyone run into this issue before? I've tried searching Google and tried a number of proposed solutions but so far none have worked.
Thank you,
Normally with problems like this it is best to isolate the code which is causing the problem. For example, create a minimal page with no other controls or external JavaScript and see if the problem persists.
It's also useful to use a decent debugger. The latest IE8 actually has a very good Visual Studio-style JavaScript debugger built in - go to your page, hit F12 and the go to the Script tab and click 'Start Debugging' and see where that leads you.
I've seen unhelpful javascript errors when a page does an AJAX postback, an exception occurs on the server, and the client javascript is unable to handle what the server returns. You could ascertain if this is happening by debugging the site, putting a breakpoint on the Page_Load method (or something similar), and see if it gets hit when trying to collapse or expand the TreeView.
When I run the web application, I notice that Page_PreRender is fired twice. This only happens the first time in a new session. It does not happen if I refresh the page, or on postbacks.
I use .NET framework 3.5 and the built in ajax functionality.
The problem is not
related to img tag with empty src
attribute (which I have seen other posts with similar problem
has mentioned). I know this because I see this in
both FireFox and IE. The posts I saw
about this stated that this was not a
problem in IE. I have also searched
and found no img tags with empty src
in the generated page source, so it
should not be this.
I have also made a simple test
page where I have included some of
the functionality, and this does not
happen.
Have anyone any suggestions on what happens?
Note:
It is the entire page cycle that is firing twice, not just render.
I've experienced it; it's probably not what you are experiencing, but I'll enter it here anyway; I've noticed it when the application does a Response.Redirect at the PreRender level, which a redirect does not stop current execution, but makes it appear the event happens twice...
Again, probably not related, but including it just in case.
I copied some code that states:
Page.LoadComplete += new EventHandler(Page_PreRender)
I did not realize that this code fire for second time my Page_PreRender event.
When I comment it, never fire twice.
I am having a strange problem. Here is the scenario
Here are my files:
Project1.aspx
Project2.aspx
They are set up the exact same, including their Page_Load functions:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If (Not Page.IsPostBack) Then
setPrevIndex(-1)
...
End If
End Sub
They are both set up this way.
Here is where I am running into a problem. When I navigate to either of these pages, i need to make sure that prevIndex is set to -1 (via the function).
For Project1.aspx when I navigate
to the page, the Page_Load fires.
For Project1.aspx when I refresh the page, the Page_Load fires.
For Project1.aspx when I press "Go" in my browsers navigation bar, traveling back to the current page, the Page_Load fires.
For Project2.aspx when I navigate
to the page, the Page_Load fires.
For Project2.aspx when I refresh
the page, the Page_Load fires.
For Project2.aspx when I press
"Go" in my browsers navigation bar,
traveling back to the current page,
the Page_Load doesn't fire at all! The function isn't even
called.
Any ideas why??? What would cause this?
Please ask for clarification.
Update:
When I press "Go" in the URL pointing to the same URL, it seems like the masterpage is the only thing that re-loads, but the Load_Page event doesn't even fire...
Any other suggestions?
Thanks,
E
Try disabling output cache and see if the problem still occurs:
<system.web>
<caching>
<outputCache enableOutputCache="false"/>
</caching>
<system.web>
Use LiveHTTPHeaders or Fiddler to make sure the page is actually being requested the same way each time. This may be an issue with caching.
Load up your website locally and go to http://yourwebsite/trace.axd
This shows a server trace for each page, along with the server status. It also shows the complete page lifecycle with timings.
Clear the current trace and then repeat your 3 visits and reloads each to Project1.aspx and Project2.aspx
What does trace.axd show now? You should have 6 entries, each with the status code of 200 and the verb GET.
If you have fewer then your problem is caching of some sort.
If you have 6 then check the details for the last one - what does is show for the page event lifecycle? It will also show the complete WebForm control hierarchy, so if this related to the master page you will be able to tell.
Try Setting the previndex to -1 in Page Init Event. I am not sure why this is happening though.
Various cache-related things can cause the request not to be made, in particular when you merely press the "go" button, so you should check your cache-headers.
If caching is the issue, you can do something like:
//ask browser to revalidate:
context.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
//and hint that the page is outdated anyhow...
context.Response.Cache.SetMaxAge(TimeSpan.Zero);
Which should convince a browser to really get a new version every pageview. You could, for instance, set these variables in the Page_Load itself ;-). If you're not using https, then the following are risk-free too:
//prevents plugin based file-open in IE+https, otherwise fine:
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
context.Response.Cache.SetNoStore();
I'll bet this solves it - and if not, I second Jeremy Steins suggestion that you use fiddler to verify that the request is really being made at all (and since you're a web-dev, get fiddler in any case, it's a handy tool to have available, and works for all browsers!).
Finally - can you tell whether any other code on the page runs when you click go? (i.e. is the entire page not running, or just Page_Load - the latter would suggest an event wire up error, which would be odd considering your load handler does sometimes fire).
It sounds like your page is cached. This would cause the Page_Load not to fire. Check that you have not set that anywhere.
Have you tried publishing the application to a different machine? It could be IIS doing something so try and eliminate that first. Assuming that your code is identical in both na only the page names differ (do a diff on the aspx and .cs files to verify) then move your application to a different server and re-test.
If it is still occurring the it really must be your browser doing something probably with respect to caching.
Try to recreate the scenario with stripped down functions on your server. If the problem persists, try to use some cache-countering methods. If not, that means it has to be your code.
If you have this (or similar) at the top of your page (or master page) this will cause it:
<%# OutputCache Duration="3600" VaryByParam="none" %>
i was working on a vb.net project and i couldn't find some controls in the code-behind file(*.vb). i was wondering is it because i was working in page_load function so controls are not loaded until after page_control event. however i was able to find them with findcontrol function of formview objective.
Controls inside of templates (such as in your FormView, or in a GridView) are not directly accessible in the code behind. You must use FindControl to get access to those controls.
If the controls are declared in the aspx then they're defined in partial class equivalent for your Page class.
This was introduced along with .Net v2.0 so that messing with the designer wouldn't screw up with your code behind file (which caused quite a few problems in some cases).
You can access the controls from your Page Load event. Sometimes IntelliSense plays tricks on you and doesn't suggest the control. Just type it in. It will work. You can close the aspx page and open it again. Sometimes that fixes it. Or just restart Visual Studio if you're annoyed by it.
However, there are a few considerations if you are interested in accessing control data at certain times during the life cycle of the page.
Server controls have their own life cycle that is similar to the Page life cycle, but the order in which the event is triggered for the controls is as follows:
Init and Unload event for a control occurs before the event is raised for the container (bottom-up).
Load event for a control occurs after the event is raised for the container (top-down).
You can find a more detailed explanation of the Page life cycle events on MSDN.
It's hard to tell what exactly the problem is; it would help if you could post some code here.
I do have two guesses/suggestions:
If you have the problem that brentkeller is describing, what usually fixes this completely for me is deleting the aspx.designer.cs file, then right-clicking on the .aspx file and select "Convert to Web Application". This re-creates the designer file.
The control is inside a template like Jason Berkan suggested. If it's in a LoginView, for example, you would use .FindControl("controlId") on the LoginView.
The controls would be part of a partial class in the same solution. Just find all references for your class name.
I occasionally have trouble with adding a control to a page and the Intellisense not recognizing the control. The compiler also seems to not recognize the control and prevents the project from being compiled. It can be very frustrating and I really haven't figured out why.
Sometimes it helps to close the aspx page and its code file, sometimes closing Visual Studio and re-opening it works. Sometimes none of it works and I just try another way to get things done.
I don't know if this is what you're experiencing, but if so, it can definitely make you scratch your head and wonder what is going on.