I have just moved to a new machine and moved from visual web developer to visual studio 2005.  when I try and open any of my websites Visual studio hangs on 'adding system.web.dll' message when I try to system to design mode..   There are a few other errors in the build. 

 

Cheers.

Andrew

check out arelated thread at this link

http://forums.asp.net/thread/1522429.aspx

 I tried the stuff in that other post to no avail. Its not a problem with the intellisense and shouldnt be a problem with AJAX because thats installed on the remote server.

 Any other ideas?

Let me try and be a bit clearer with my setup. 

I was running VWD 2005 with the latest AJAX RC installation.

A couple of the websites I am working on are on a remote server but this does have AJAX installed on it.

I have a new development machine.  This has Visual Studio 2005 installed.  I have not yet installed AJAX on it but I am going to try this.. 

It often comes up with the error of not being able to find reference to microsoft.web.extensions.dll.  Even though this is located in the bin folder.

Anyway, I hope someone can help me.

Thanks

Andrew

You must remove old Ajax from bin. RC is installed in GAC and what you are seeing is a conflict between two different versions. Please read RC installation notes carefully:

http://ajax.asp.net/docs/InstallingASPNETAJAX.aspx 

http://ajax.asp.net/docs/ConfiguringASPNETAJAX.aspx 

I remove those dlls from the bin .  the ajaxcontroltoolkit one and the Microsoft.Web.Extensions.Design.dll.  This doesnt stop it from hanging on trying to add reference to system.web.dll.  I guess I need to remove the reference to the dlls from the web.config file??

 Thanks for being patient

Andrew

It might be easier if i post the web.config.

 <?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
 <configSections>
  <sectionGroup name="microsoft.web" type="Microsoft.Web.Configuration.MicrosoftWebSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
   <sectionGroup name="scripting" type="Microsoft.Web.Configuration.ScriptingSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
    <sectionGroup name="webServices" type="Microsoft.Web.Configuration.ScriptingWebServicesSectionGroup, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
     <section name="jsonSerialization" type="Microsoft.Web.Configuration.ScriptingJsonSerializationSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
     <section name="profileService" type="Microsoft.Web.Configuration.ScriptingProfileServiceSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
     <section name="authenticationService" type="Microsoft.Web.Configuration.ScriptingAuthenticationServiceSection, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false"/>
    </sectionGroup>
   </sectionGroup>
  </sectionGroup>
 </configSections>
 <connectionStrings>
 </connectionStrings>
 <system.web>
  <roleManager enabled="true" defaultProvider="CustomizedRoleProvider">
   <providers>
    <add name="CustomizedRoleProvider" type="System.Web.Security.SqlRoleProvider" applicationName="/" connectionStringName="ASPNETDBConnectionString"/>
   </providers>
  </roleManager>
  <pages>
   <controls>
    <add tagPrefix="asp" namespace="Microsoft.Web.UI" assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagPrefix="asp" namespace="Microsoft.Web.UI.Controls" assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   </controls>
   <tagMapping>
    <add tagType="System.Web.UI.WebControls.CompareValidator" mappedTagType="Microsoft.Web.UI.Compatibility.CompareValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagType="System.Web.UI.WebControls.CustomValidator" mappedTagType="Microsoft.Web.UI.Compatibility.CustomValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagType="System.Web.UI.WebControls.RangeValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RangeValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagType="System.Web.UI.WebControls.RegularExpressionValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RegularExpressionValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagType="System.Web.UI.WebControls.RequiredFieldValidator" mappedTagType="Microsoft.Web.UI.Compatibility.RequiredFieldValidator, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add tagType="System.Web.UI.WebControls.ValidationSummary" mappedTagType="Microsoft.Web.UI.Compatibility.ValidationSummary, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   </tagMapping>
   <namespaces>
    <clear/>
    <add namespace="System"/>
    <add namespace="System.Collections"/>
    <add namespace="System.Collections.Specialized"/>
    <add namespace="System.Configuration"/>
    <add namespace="System.Text"/>
    <add namespace="System.Text.RegularExpressions"/>
    <add namespace="System.Web"/>
    <add namespace="System.Web.Caching"/>
    <add namespace="System.Web.SessionState"/>
    <add namespace="System.Web.Security"/>
    <add namespace="System.Web.Profile"/>
    <add namespace="System.Web.UI"/>
    <add namespace="System.Web.UI.WebControls"/>
    <add namespace="System.Web.UI.WebControls.WebParts"/>
    <add namespace="System.Web.UI.HtmlControls"/>
   </namespaces>
  </pages>
  <!--
            Set compilation debug="true" to insert debugging
            symbols into the compiled page. Because this
            affects performance, set this value to true only
            during development.
        -->
  <compilation debug="true">
   <assemblies>
    <add assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Web.Services, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.DirectoryServices.Protocols, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.EnterpriseServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.ServiceProcess, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Web.RegularExpressions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/></assemblies>
  </compilation>
  <httpHandlers>
   <remove verb="*" path="*.asmx"/>
   <add verb="*" path="*.asmx" validate="false" type="Microsoft.Web.Script.Services.ScriptHandlerFactory, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   <add verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler" validate="false"/>
  </httpHandlers>
  <httpModules>
   <add name="WebResourceCompression" type="Microsoft.Web.Handlers.WebResourceCompressionModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   <add name="ScriptModule" type="Microsoft.Web.UI.ScriptModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
  </httpModules>
  <!--
            The <authentication> section enables configuration
            of the security authentication mode used by
            ASP.NET to identify an incoming user.
        -->
  <anonymousIdentification enabled="False"/>
  <!-- You should ALWAYS customize the Membership provider and specify an applicationName... see http://weblogs.asp.net/scottgu/archive/2006/04/22/Always-set-the-_2200_applicationName_2200_-property-when-configuring-ASP.NET-2.0-Membership-and-other-Providers.aspx for more details... -->
  <membership defaultProvider="CustomizedProvider">
   <providers>
    <add name="CustomizedProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ASPNETDBConnectionString" applicationName="/" minRequiredPasswordLength="5" minRequiredNonalphanumericCharacters="0" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" passwordFormat="Clear"/>
    <add name="SqlProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ASPNETDBConnectionString" applicationName="/" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="false" passwordFormat="Clear"/>
   </providers>
  </membership>
  <!-- You should ALWAYS customize the Profile provider and specify an applicationName... see http://weblogs.asp.net/scottgu/archive/2006/04/22/Always-set-the-_2200_applicationName_2200_-property-when-configuring-ASP.NET-2.0-Membership-and-other-Providers.aspx for more details... -->
  <profile defaultProvider="CustomProfileProvider" enabled="true">
   <providers>
    <add name="CustomProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ASPNETDBConnectionString" applicationName="/"/>
   </providers>
   <properties>
    <add name="CompanyName" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Website" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Address" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Postcode" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Telephone" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Fullname" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
    <add name="Email" type="string" serializeAs="String" defaultValue="" allowAnonymous="false"/>
   </properties>
  </profile>
  <!--
            The <authentication> section enables configuration
            of the security authentication mode used by
            ASP.NET to identify an incoming user.
        -->
  <authentication mode="Forms"/>
  <!--
            The <customErrors> section enables configuration
            of what to do if/when an unhandled error occurs
            during the execution of a request. Specifically,
            it enables developers to configure html error pages
            to be displayed in place of a error stack trace.

        <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
            <error statusCode="403" redirect="NoAccess.htm" />
            <error statusCode="404" redirect="FileNotFound.htm" />
        </customErrors>
        -->
 </system.web>
 <system.webServer>
  <validation validateIntegratedModeConfiguration="false"/>
  <modules>
   <add name="ScriptModule" preCondition="integratedMode" type="Microsoft.Web.UI.ScriptModule, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
  </modules>
  <handlers>
   <remove name="WebServiceHandlerFactory-ISAPI-2.0"/>
   <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="Microsoft.Web.Script.Services.ScriptHandlerFactory, Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   <add name="ScriptResource" verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler"/>
  </handlers>
 </system.webServer>
</configuration>

I began encountering this same problem after attempting to install Microsoft's AJAX software a week or so ago (Mikhail would be very disappointed -- I did NOT read the instructions carefully prior to installing -- to my detriment).  After that, upon clicking into Design View, or upon attempting to change anything while in design view, Visual Studio 2005 would hang for several minutes before moving.  I uninstalled the three AJAX components, still to no avail.

Here's what finally fixed it for me: I went back to the Add/Remove Programs control panel, then chose Change/Remove for the Microsoft .NET Framework 2.0.  One of the options is to Repair Microsoft .NET Framework 2.0 to its original state.  I chose this option, and after a system restart, Visual Studio is back to normal.

Hope this helps.

-Paul
 

I have now solved this problem with the help of Mikhail.  

 I installed the latest version of AJAX RC1.  I removed the microsoft.web.extensions.design.dll from the bin folder.  I replaced all the references to the microsoft.web.extensions with the new system.web.extensions references using the microsoft, installation of AJAX help.  Then I rebuilt the website. That sorted it.

So you are telling me that I HAVE to install AJAX ? Because I'm getting this error, and I do not have AJAX installed. I do not have web.extensions in my web.config file. I have repaired the 2.0 Framework. But so far, no matter what I do, I continue to get the "Adding reference to 'System.Web.dll'... message in the status bar. Any other advice?

 

I am having serious issues with this bug.  I have been down all day tring to resolve this issue.  The "Adding reference to system.web.dll" message only appears when I open 1 specific project.  I can create a new project and things are dandy.  I have removed the references to the AJAX toolkit, system.web and system.web.extensions.  Can you tell me exactly what I need to do here?  I read the pages you link to regarding a correct install and followed the instructions with no luck.  Help!!

I had the same problem but the solution had nothing to to with AJAX.  I had references to assemblies of packages that I haven't installed yet.  Once I removed them from the web.config, all was fine.

sorry, dbl post.