>>
>>Which directory should I add .cs files in order to be able to use them in the project? In App_Code ?
>>
>
>If you are using a "Web Application"-style project, it doesn't really matter. Pick a place where it makes the most sense to you. A webapp project compiles your DLL's using normal filenames (eg. they're usually the project name assuming you didn't override this). If it's a website project, yeah, drop the class in App_Code.

I'm not sure which type it is. Anyway, I dropped them in App_Code, I'm having this problem now

Error 230 The type 'skmControls2.GridView' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\fcadmin\868c8591\eb7bc28a\App_Code.vaynekdi.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\fcadmin\868c8591\eb7bc28a\assembly\dl3\baf91415\a651e021_52b4c801\skmControls2.DLL' c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\fcadmin\868c8591\eb7bc28a\App_Web_jf83khew.6.cs 2508

I don't understand where this App_Code.vaynekdi.dll comes from and can I somehow get rid of it? The name of the library should be skmControls2.DLL.

May be I should change the Namespace in the original project to something different ?

Thanks again for your help.