Gewgala:

Do you clean your project prior to building it?

Check if you are pointing the same code behind file in two different apsx forms, i found this answer in another forum and solved my problem, when faced similar one.

Brad,

I found out that if you rename the .aspx and the .aspx.cs file, rebuild web site, and rename the files back to the originals, the error goes away.

- jtaylorwehco

Let see if it works for me!

Let see if it works for me!

 Well, I am getting the same error message, but for a different reason. 

 - I tried the first suggestion above, change the build options.  That did not work. 

 - I do not have any other copies of pages with the same names, so that rules that out.

I am reasonable certain my problem is because the upload control i am using (the control that generates the error message) is buried so far down in the templates of my GridView that simply putting the control name in the code behind does not fully address it.  When i put the fileupload, with this name outside of the GridView it works fine.  But, when it is in the InsertItem template of one of the Fields, it generates this message.

I am hoping i just need to learn how to address the control properly in the code behind.  Perhaps

instead of

fupEventLogo.enabled = true;

I need something like

gvEventInformation.Field6LogoUploadFilename.InsertItemTemplate.fupEventLogo.enabled = true;

 or close to that.  (This example does not work, but i'll bet it is moving in the right direction!)

I will just keep trying variations until I get it or i successfully address in the controls collection

If you have any suggestions, i would love to hear them!

Jon

 Hi,

I was correct, same problem but for a totally different reason.  So, incase someone else runs into this issue, I will share what I learned.

I was on the right track that the issue was due to the FileUpload control being inside the DetailsView Control.  This made it so that my code could not directly access the FileUpload.  But, i was wrong, i could not fully qualify the name of the control to access it like I used to in VB (VB2 through VB6).  I needed to use the FindControl Method.  For this, in my code behind, I created a new Control of the type FileUpload and set it equal to the one in my web page.  Here is the csharp code i used

FileUpload FileLogo2Upload = (FileUpload)dvEventInformation.FindControl("fupEventLogo");

The syntax for including the control type in ( ) seemed a bit odd to me, but it works.

Now, in my code behind, whenever I needed info about the original control, I accessed it from FileLogo2Upload

I also had RadioButtons in the template in the DetailView, so I created a new control for each of them, using Find Control so i could access the info from the new control to see which was checked.

Hope this helps someone

Jon

The id of the lbl cotrol must be different therefor it shows the error, to find this go to the code behind page and type the lebel name , it must nit be displayed..

 Well, this problem seems to have a multitude of problems and solutions. Here's another one that may be indicative of others and hasn't been mentioned yet.

If you add a control IN something.aspx where something.aspx.designer.cs also exists, you have to add the control in something.aspx.designer.cs in the following manner

protected global::System.Web.UI.WebControls.Label labelName;

of course replacing the control type with what you need.

(at least this works for me on VS2005 SP1)

Cheers,

Partizan

the other thing I noticed after wrestling with some of the suggested solutions is that if I don't open it as a project and I open it as a website in VS2008, it runs fine.

Read all the entries about duplicates in back up files and thought that's embarressing and was certain that wasn't my problem!

 Do a find of the entire project to make sure!!  Even though the name in the solution explorer is different, it doesn't change it in the code behind file.

Thank you so much for this post. I spent a good deal of time trying to figure out the problem before

I check on the forums. How silly of me..hehee..I had the back up copy too. Once I excluded everything

else worked fine. :)

Thank you jcevans this worked for me