The type 'WebPartTests.Test1' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\...\Weather.DLL' and 'c:\WINDOWS\...\App_Code.ukqokk-6.dll'

I am trying to run a web part on my web page using a class file.

The class file is in the App_Code folder and just inherts from the WebPart class:

namespace WebPartTests
    public class Test1 : WebPart

        public Test1() { }

        protected override void Render(HtmlTextWriter writer)


This should display on the default.aspx page:

<%@ Register TagPrefix="wp" Namespace="WebPartTests" %>

        <asp:WebPartZone ID="WebPartZone1" runat="server">
                <wp:Test1 id="TestPart1" runat="server" Title="Web Part Test" />

However although it builds ok, when I run it I get the following error:

Compiler Error Message: CS0433: The type 'WebPartTests.Test1' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\f40803c9\3af30b4d\App_Code.jfw1hrqs.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\f40803c9\3af30b4d\assembly\dl3\851dd24c\87bfe724_f0cac801\Weather.DLL'

I have tried clearing out all the temporary files, and changing the batch property for compilation in the web.config file.

What else can I try?

Note this really is just a default.aspx web page and a Test1.cs class file project - there is very little to it.
Who is Participating?

Improve company productivity with a Business Account.Sign Up

samtran0331Connect With a Mentor Commented:
Normally, clearing the server cache clears up this type of problem.
I'll have to try to recreate the issue...but is the class code you posted pretty much the whole thing?
>>I have tried clearing out all the temporary files
but did you clear the system cache?

go to the folder:
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files

and delete everything in it (you might have to stop IIS and close Visual Studio first).

everytime you debug/build, the dll's and compiled code get thrown in there, if you don't clear that folder out occasionally (I do it at least 2x every day while coding) you will get these kind of errors
purplesoupAuthor Commented:
Thanks for the suggestion, unfortunately I am still getting the same error.

I have cleared out all the files from
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\

I have deleted all the files in the bin and obj subfolders.

I have renamed the assembly it builds.

I am still getting the same problem:

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0433: The type 'WebPartTests.Test1' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\f40803c9\3af30b4d\assembly\dl3\702cfcf4\57168ee5_f6cac801\Test1.DLL' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\f40803c9\3af30b4d\App_Code.mrmi744b.dll'

Source Error:

Line 15:         <asp:WebPartZone ID="WebPartZone1" runat="server">
Line 16:             <ZoneTemplate>
Line 17:                 <wp:Test1 id="TestPart1" runat="server" Title="Web Part Test" />
Line 18:             </ZoneTemplate>
Line 19:         </asp:WebPartZone>
purplesoupAuthor Commented:
Here is an example of the problem
purplesoupAuthor Commented:
You tried to help and gave some intelligent suggestions, even though it didn't fix the problem.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.