Element 'X' Is Not A Known Element - Web Application?
Aug 23, 2010
I converted a forms website into an application and everything has been working just fine until now. I keep getting the green squiggly lines and the error that Element 'X' is not a known element. This is on almost every element, Gridview, Label, Update Panel, Hyperlink Field, Bound Field, etc...
so ajax and asp are viable prefixes. The very odd thing is that it is only happening on a few user controls, all other user controls are fine and the errors never show up. I have tried rebooting and everything and nothing seems to fix it. All masterpages, web paages, and about 90% of the user controls are fine, its only on a few user controls and super annoying!
I'm looking at an asp.net application, i notice that there are assemblies defined into two places. In web.config there is configuration/system.web/compilation/assemblies/add elements. In the project file there are references setup under the Project/ItemGroup/Reference elements.
I was wondering, what is the difference between assemblies/references added in either location?
This doesn't happen when I create the site in my local drive. Is there a workaround to this. Even if I add the missing parts, I keep getting the same error.
I would like to select an element that is in the same TR as another element I found with a selector. The selector itself: $("input[name='sMessageValue']","#messageTable") Now I have this element and got its value I would like to find a checkbox located in the same TR, i tried this as starting point : $(this).(':parent').val(). But seems not the right thing to do.
You're making a website with ASP.NET 4.0/C#, although xml alone is suitable for this example. The site will have a site map and a default page with a menu control, as follows:Web.sitemap
Element 'content' is not a known element. this can occur if there is a compilation error in the website, or the web.config file is missing.
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:Content --- showed a green wavy line , and on hover displayed the above error.
Now I am having certain problems.
1. Visual Studio 2010 hangs when I try to use ToolBox.
2. Intellisense for asp.net controls is not working.
I have tried replacing web.config file (frm backup) , tried to debug - it doesnt show anything.
All other websites are working alright. Have problem with only one of the websites.
I upgraded from VS 2008 to VS 2010 and now the AJAX elements are not recognised by the source code editor, e.g. UpdatePanel, ScriptManager, etc. I get warnings in VS and no intellisense for those elements. When I run the site, all the AJAX controls work OK though.
I got this errors while trying to use an example from the ASP.NET 3.5 Unleashed book.
Webform1.aspx
[Code]....
LengthValidator.cs
[Code]....
As from the book's note, I think I added this line correctly:
[Code]....
However, the compiler kept complaining that:
Warning 1 Element 'LengthValidator' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing. C:Visual Studio 2010 ASP.NET ProjectsWebApplicationFourWebApplicationFourWebForm1.aspx 16 17 WebApplicationFour
I am using dotnetCHARTING: the dll is installed in the GAC and referenced in my web.config (all versions appear to match). The project has a reference to the dll.
The site code compiles ok, but all aspx pages using the charting library complain that the Chart tag does not exist (warning that it might be a compile error). The aspx pages do not render the charts.
Element 'AsyncPostBackTrigger' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.
My app is working properly but visual studio showing warning like that.
I used MicrosoftReportview in my project , The reports are avalable in project folderWhen I run web site in Server (not VS development server) . It give this type of error.Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: The element 'buildProviders' cannot be defined below the application level.
When putting this html portion inside the div element : do the things respectively:
<ol> <li> Create button control </li> <li> Assign it to the main user </li> <li> Let me know what happened </li> </ol>
This is how it shows on the page: (Please look at the numbers) So the question is why this is happening?Why are the numbers are appearing outside of the div element. I used:
.messageContainer ol { list-style-position:inside; margin-left:5px; }
which worked just fine but now this is what happened.
I have a label that is associated with a css class "applycolor", which is applied the first time it is displayed on a page.
[Code]....
defined in css, label.applycolor { width: 200px; color: red; }
Based upon the selection of a radio button, i would like to change its color back to normal. I tried to use lblHomeAdd.Style.Remove("applycolor"); but this did not give me a solution.
I've seen the <script type="text/C#> with intellisense.
If it is possible to script client side scripts in C#, some infomation or reference on how to do it. For example, do I need using statements, is the script compiled on the server.. etc.
I have a web form with usual elements (first name, last name, etc). The Postback URL is a different website altogether as the form is intented to post lead information to another website.
The site that accepts the lead is expecting First Name to come over as "FName", and Last Name to come over as "LName". Is there any way I can set the ID of a textbox to "txtFName", but submit it over the wire as "FName"? I tried changing the name attribute, but at runtime it sets the name = id.
