Yanic, is that error happening in your "Silverlight" project?

AFAIK, .NET references should have v3.5 version, not 2.0.5. Silverlight used 2.0.5 though.

we dont use silverlight in out project .

i added system.xml

and now i got this error :

1. Error 35 The type 'System.CodeDom.Compiler.GeneratedCodeAttribute' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll' and 'c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\assembly\dl3\d17c4afd\00d8ffe2_fa0aca01\System.DLL' c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\App_GlobalResources.m-tlqiub.en_0.cs 12

2.Error 36 The type or namespace name 'GeneratedCodeAttributeAttribute' does not exist in the namespace 'System.CodeDom.Compiler' (are you missing an assembly reference?) c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\App_GlobalResources.m-tlqiub.en_0.cs 12

maybe i need to reinstall framework .net 3.5 ?

Yaniv, it's quite weird that your system references are affected. I don't think you need to reinstall .net framework 3.5 as the WebUI installation doesn't affect system and .net references.

I suggest you to clear the ASP.NET temporary files. You'll need to stop your IIS first before deleting the temporary files. Then rebuild your Visual Studio project.

In case it still didn't work, try to create a blank ASP.NET project and run a blank webform. 

still no go

1. Error 34 The type 'System.CodeDom.Compiler.GeneratedCodeAttribute' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll' and 'c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\assembly\dl3\d17c4afd\00143166_691fca01\System.DLL' c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\App_GlobalResources.ih8e1vbg.en_0.cs 12

2. Error 35 The type or namespace name 'GeneratedCodeAttributeAttribute' does not exist in the namespace 'System.CodeDom.Compiler' (are you missing an assembly reference?) c:\Documents and Settings\yaniv\Local Settings\Temp\Temporary ASP.NET Files\cemaxcrm_web\993ba968\573efc86\App_GlobalResources.ih8e1vbg.en_0.cs 12

Have you tried to create new ASP.NET application?

Also, does Intersoft Live samples that come with the installation package work? Can try both the Live Samples (executable) and C# Solution sample project.

Let me know which one work and which one not -- in details.

all samples work fine .

still same problem with system.dll namesapce

still the errors !!!!

Error 28 'ExtensionAttribute' is ambiguous in the namespace 'System.Runtime.CompilerServices'. InternalXmlHelper.vb

Error 27 'XElement' is ambiguous in the namespace 'System.Xml.Linq'. InternalXmlHelper.vb

Error 30 'XName' is ambiguous in the namespace  . InternalXmlHelper.vb

?????????????????????

problem fixed

Yaniv, I'm glad your issue is resolved. Would you mind to share your steps to resolve? That'll be helpful for others who also running on the same issue.

Thanks,
James.

hi all

the problem began after installing sp1 2009 we got an error says :

1.'extensionattribute' is ambiguous in the namespace 'system.runtime.compilerservices'. internalxmlelper.vb

2. xelement is ambiguous in the namespace 'system.xml.linq'. internalxmlhelper.vb

what happend that the system.xml.linq.dll (v3.5) got overwrited by the system.xml.linq.dll in the aqua/bin folder .

the solve it just overwrite the system.xml.linq.dll in the aqua/bin folder with that from framework 3.5

have a good day!

and thank u james for the responses.