The name controlname does not exist in the current context

Question

I have a web application that I m working on  ASP NET2 0 with C   using VS2005   Everything was working fine  and all of a sudden I get the error   Error  1   The name  Label1  does not exist in the current context  and 43 others of the sort for each time that I used a control in my codebehind of the page   This is only happening for 1 page  And it s as if the codebehind isn t recognizing the controls  Another interesting thing is that the intellisense isn t picking up any of the controls either    I have tried to  clean the solution file  delete the obj file  exclude the files from the project then re-add them  close VS and restart it  and even restart my computer  but none of these have worked

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I had the same issue  my problem was not having space between two attributes   AutoGenerateColumns  False DataKeyNames  ProductID    instead of   AutoGenerateColumns  False  DataKeyNames  ProductID

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I had the same error message  My code was error-free and working perfectly  then I decided to go back and rename one of my buttons and suddenly it s giving me a compile error accompanied by that blue squiggly underline saying that the control doesn t exist in current context      Turns out Visual Studio was being dumb  as the problem was related to the backup files I had made of my aspx cs class  I deleted those and the errors went away

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I get the same error after i made changes with my data context  But i encounter something i am unfamiliar with  I get used to publish my files manually  Normally when i do that there is no App Code folder appears in publishing folder  Bu i started to use VS 12 publishing which directly publishes with your assistance to the web server  And then i get the error about being precompiled application  Then i delete app code folder it worked  But then it gave me the Data Context error that you are getting  So i just deleted all the files and run the publish again with no file restrictions  every folder  amp  file will be published  then it worked like a charm

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I had a similar problem when tweaking with a Repeater after converting it from a DataList   Problem was that I accidentally united 2 attributes when deleting an unneeded one    lt asp Repeater runat  server  ID  ClientsRP DataSourceID  ClientsDS  gt                     lt  asp Repeater gt    And this prevented the generation of the repeater in the design file

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Also  make sure you have no files that accidentally try to inherit or define the same  partial  class as other files  Note that these files can seem unrelated to the files where the error actually appeared

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I had the same problem   It turns out that I had both  MyPage aspx  and  Copy of MyPage aspx  in my project

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I ran into this same issue  Apparently  you shouldn t call a class in the BLL the same name as one of the  aspx  aspx cs files  I thought they would not be in the same scope  etc  but it messed with Visual Studio s internal workings too much  I m a bit surprised there isn t something to keep you from doing this if it is going to produce that type of error  Anyway  just delete the  aspx  aspx cs files and rebuild your project  Then bring them back in under another name  You can copy paste your code into another editor if you don t want to retype it all back in

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this error often occurs when you miss runat  server

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In my case I had to hunt through the 417  controlname not found  errors to find an actual error  I had replaced a DLL but not updated the version number in the web config  Fixed that and built successfully  3 minutes after that all the other errors had resolved themselves

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1  Check the CodeFile property in  lt   Page CodeFile  filename aspx cs     in  filename aspx  page   your Code behind file name and this Property name should be same   2 you may miss runat  server  in code

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In my case  when I created the web form  it was named as WebForm1 aspx and respective names  WebForm1   Letter  I renamed that to something else  I renamed manually at almost all the places  but one place in designer file was still showing it as  WebForm1     I changed that too and got rid of this error

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Check your code behind file name and Inherits property on the  Page directive  make sure they both match

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I ran into this same error  except it was a WPF error  I was rearranging projects and had a control defined in like this    lt local CustomControl Name  Custom    gt     In my code behind I tried using Custom Blah  but I got the error    The name  Custom  does not exist in the current context   What did the trick for me was changing my control in Xaml to this    lt local CustomControl x Name  Custom    gt    Hope this helps someone out there

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exclude any other pages that reference the same code-behind file  for example an older page that you copied and pasted

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Solution option  2 offered above works for windows forms applications and not web aspx application  I got similar error in web application  I resolved this by deleting a file where I had a user control by the same name  this aspx file was actually a backup file and was not referenced anywhere in the process  but still it caused the error because the name of user control registered on the backup file was named exactly same on the aspx file which was referenced in process flow  So I deleted the backup file and built solution  build succeeded    Hope this helps some one in similar scenario   Vijaya Laxmi

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I know this is an old question  but I had a similar problem and wanted to post my solution in case it could benefit someone else   I encountered the problem while learning to use    ASP NET 3 5 C  VS2008   I was trying to create an AJAX-enabled page  look into a tutorial about using the ScriptManager object if you aren t familiar with this   I tried to access the HTML elements in the page via the C  code  and I was getting an error stating the the identifier for the HTML ID value  does not exist in the current context    To solve it  I had to do the following   1  Run at server  To access the HTML element as a variable in the C  code  the following value must be placed in the HTML element tag in the aspx file   runat  server    Some objects in the Toolbox in the Visual Studio IDE do not automatically include this value when added to the page   2  Regenerate the auto-generated C  file    In the Solution Explorer  under the aspx file there should be two files    aspx cs and   aspx designer cs   The designer file is auto-generated  Delete the existing   aspx designer cs file   Make sure you only delete the designer file   Do not delete the other one  because it contains your C  code for the page  Right-click on the parent aspx file  In the pop-up menu  select Convert to Web Application    Now the element should be accessible in the C  code file

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I had the same issue since i was tring to re produce the aspx file from a visual studio 2010 project so the controls had  clientidmode  Static  property  When this is removed it was resolved

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I fixed this in my project by backing up the current files  so I still had my code   deleting the current aspx  and child pages   making a new one  and copying the contents of the backup files into the new files

[c#] The name 'controlname' does not exist in the current context

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