Please be sure to have Visual Studio 2010 (or Visual Web Developer)  along with Windows Azure SDK 1.4 Refresh  installed in your machine. 

Get the full working Sample at: http://aspmvc3webroleazure.codeplex.com/

Step 1. Please create a MVC2 Web Role as below:

Step 2: In the Visual Studio when solution is ready now add a new project as below:

Step 3: Create a new “Web” based “ASP.NET MVC 3 Web Application” as below:

Step 4:  When asked to select the MVC3 Web Application type please select “Internet Application” along with View Engine “Razor” as below: 

Step 5: Lets compare references in “Web Role” and “MVC 3 Web Application” you will see something as below:

Step 6: You will need to add & remove following references in your Web Role. 

Let’s start by removing System.web.MVC from Web Role first and then add the following references in the Web Role:

Following reference from location: C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies

• System.Web.Mvc.dll

All below references from location: c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\Assemblies\

• Microsoft.Web.Infrastructure
• System.Web.Helpers
• System.Web.Razor
• System.Web.WebPages
• System.Web.WebPages.Deployment
• System.Web.WebPages.Razor

Step 7: Please be sure to set “Copy Local as True” for all above modules, like as below:

Step 8:  Now open Web Role Based web.config and replace with ASP.NET MVC 3 based Web.Config as below:

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=152368

  -->
<configuration>
  <connectionStrings>
    <add name="ApplicationServices"
         connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true"
         providerName="System.Data.SqlClient" />
  </connectionStrings>
  <appSettings>
    <add key="webpages:Version" value="1.0.0.0"/>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.WebPages, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
      </assemblies>
    </compilation>
    <authentication mode="Forms">
      <forms loginUrl="~/Account/LogOn" timeout="2880" />
    </authentication>
    <membership>
      <providers>
        <clear/>
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
             enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
             maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
             applicationName="/" />
      </providers>
    </membership>
    <profile>
      <providers>
        <clear/>
        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />
      </providers>
    </profile>
    <roleManager enabled="false">
      <providers>
        <clear/>
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
      </providers>
    </roleManager>
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages"/>
      </namespaces>
    </pages>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Step 9: Now remove "ASP.NET MVC3 Web Application" from your solution. The final solution will look like as below:

Step 10. Lets take a final look at our included references

Step 11. Now test your application in development fabric and verify it working successfully as below:

Step 12: Now package and deploy your application to Windows Azure Management Portal and test it working successfully  in as below:

Get the full working Sample at: http://aspmvc3webroleazure.codeplex.com/