diff --git a/build/dependencies.props b/build/dependencies.props
index e3b21668ba..6bad2ab449 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -21,9 +21,9 @@
     <MicrosoftAspNetCoreHttpAbstractionsPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreHttpAbstractionsPackageVersion>
     <MicrosoftAspNetCoreHttpPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreHttpPackageVersion>
     <MicrosoftAspNetCoreHttpsPolicyPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreHttpsPolicyPackageVersion>
-    <MicrosoftAspNetCoreMvcPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreMvcPackageVersion>
+    <MicrosoftAspNetCoreMvcPackageVersion>2.1.0-a-preview2-application-part-18617</MicrosoftAspNetCoreMvcPackageVersion>
     <MicrosoftAspNetCoreMvcRazorViewCompilationPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreMvcRazorViewCompilationPackageVersion>
-    <MicrosoftAspNetCoreMvcTestingPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreMvcTestingPackageVersion>
+    <MicrosoftAspNetCoreMvcTestingPackageVersion>2.1.0-a-preview2-application-part-18617</MicrosoftAspNetCoreMvcTestingPackageVersion>
     <MicrosoftAspNetCoreRazorDesignPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreRazorDesignPackageVersion>
     <MicrosoftAspNetCoreRewritePackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreRewritePackageVersion>
     <MicrosoftAspNetCoreServerIISIntegrationPackageVersion>2.1.0-preview2-30355</MicrosoftAspNetCoreServerIISIntegrationPackageVersion>
diff --git a/src/UI/IdentityBuilderUIExtensions.cs b/src/UI/IdentityBuilderUIExtensions.cs
index 9e276d5ad9..fd65649772 100644
--- a/src/UI/IdentityBuilderUIExtensions.cs
+++ b/src/UI/IdentityBuilderUIExtensions.cs
@@ -1,10 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
-using System.IO;
-using System.Linq;
-using System.Reflection;
 using Microsoft.AspNetCore.Identity.UI;
 using Microsoft.AspNetCore.Identity.UI.Services;
 using Microsoft.AspNetCore.Mvc.ApplicationParts;
@@ -32,7 +28,7 @@ namespace Microsoft.AspNetCore.Identity
         public static IdentityBuilder AddDefaultUI(this IdentityBuilder builder)
         {
             builder.AddSignInManager();
-            AddAdditionalApplicationParts(builder);
+            AddRelatedParts(builder);
 
             builder.Services.ConfigureOptions(
                 typeof(IdentityDefaultUIConfigureOptions<>)
@@ -42,7 +38,7 @@ namespace Microsoft.AspNetCore.Identity
             return builder;
         }
 
-        private static void AddAdditionalApplicationParts(IdentityBuilder builder)
+        private static void AddRelatedParts(IdentityBuilder builder)
         {
             // For preview1, we don't have a good mechanism to plug in additional parts.
             // We need to provide API surface to allow libraries to plug in existing parts
@@ -51,56 +47,19 @@ namespace Microsoft.AspNetCore.Identity
             // * Discovery of the parts.
             // * Ordering of the parts.
             // * Loading of the assembly in memory.
-            var thisAssembly = typeof(IdentityBuilderUIExtensions).Assembly;
-            var additionalReferences = thisAssembly
-                .GetCustomAttributes<AssemblyMetadataAttribute>()
-                .Where(am => string.Equals(am.Key, "Microsoft.AspNetCore.Mvc.AdditionalReference"))
-                .Select(am => am.Value.Split(',')[0])
-                .ToArray();
 
             var mvcBuilder = builder.Services
                 .AddMvc()
-                .ConfigureApplicationPartManager(apm =>
+                .ConfigureApplicationPartManager(partManager =>
                 {
-                    foreach (var reference in additionalReferences)
+                    var thisAssembly = typeof(IdentityBuilderUIExtensions).Assembly;
+                    var relatedAssemblies = RelatedAssemblyAttribute.GetRelatedAssemblies(thisAssembly, throwOnError: true);
+
+                    foreach (var assembly in relatedAssemblies)
                     {
-                        var fileName = Path.GetFileName(reference);
-                        var filePath = Path.Combine(Path.GetDirectoryName(thisAssembly.Location), fileName);
-                        var additionalAssembly = LoadAssembly(filePath);
-                        // This needs to change to additional assembly part.
-                        var additionalPart = new AssemblyPart(additionalAssembly);
-                        if (!apm.ApplicationParts.Any(ap => HasSameName(ap.Name, additionalPart.Name)))
-                        {
-                            apm.ApplicationParts.Add(additionalPart);
-                        }
+                        partManager.ApplicationParts.Add(new CompiledRazorAssemblyPart(assembly));
                     }
                 });
-
-            bool HasSameName(string left, string right) => string.Equals(left, right, StringComparison.Ordinal);
-        }
-
-        private static Assembly LoadAssembly(string filePath)
-        {
-            Assembly viewsAssembly = null;
-            if (File.Exists(filePath))
-            {
-                try
-                {
-                    viewsAssembly = Assembly.LoadFile(filePath);
-                }
-                catch (FileLoadException)
-                {
-                    throw new InvalidOperationException("Unable to load the precompiled views assembly in " +
-                        $"'{filePath}'.");
-                }
-            }
-            else
-            {
-                throw new InvalidOperationException("Could not find the precompiled views assembly for 'Microsoft.AspNetCore.Identity.UI' at " +
-                    $"'{filePath}'.");
-            }
-
-            return viewsAssembly;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/UI/Microsoft.AspNetCore.Identity.UI.csproj b/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
index 25244e400e..7e75bee44d 100644
--- a/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
+++ b/src/UI/Microsoft.AspNetCore.Identity.UI.csproj
@@ -2,15 +2,13 @@
   
   <PropertyGroup>
     <Description>ASP.NET Core Identity UI is the default Razor Pages built-in UI for the ASP.NET Core Identity framework.</Description>
-    <PrecompiledDescription>Precompiled views assembly for the ASP.NET Core Identity UI package.</PrecompiledDescription>
+    <ViewAssemblyDescription>Compiled Razor views assembly for the ASP.NET Core Identity UI package.</ViewAssemblyDescription>
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership;razorpages</PackageTags>
     <EnableApiCheck>false</EnableApiCheck>
     <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
-    <RazorCompileOnBuild>true</RazorCompileOnBuild>
-    <PrecompiledAssemblyTitle Condition=" '$(PrecompiledAssemblyTitle)' == '' ">$(RazorTargetName).dll</PrecompiledAssemblyTitle>
-    <PreserveCompilationContext>false</PreserveCompilationContext>
+    <EnableDefaultCompiledViewAssemblyLoadBehavior>false</EnableDefaultCompiledViewAssemblyLoadBehavior>
   </PropertyGroup>
 
   <ItemGroup>
@@ -39,7 +37,7 @@
     </AssemblyAttribute>
 
     <RazorAssemblyAttribute Include="System.Reflection.AssemblyDescriptionAttribute">
-      <_Parameter1>$(PrecompiledDescription)</_Parameter1>
+      <_Parameter1>$(ViewAssemblyDescription)</_Parameter1>
     </RazorAssemblyAttribute>
     <RazorAssemblyAttribute Include="System.Reflection.AssemblyMetadataAttribute" Condition="'$(BuildNumber)' != ''">
       <_Parameter1>BuildNumber</_Parameter1>
@@ -60,8 +58,7 @@
       <ExpectedOutputFile>$(OutputPath)$(RazorTargetName).dll</ExpectedOutputFile>
     </PropertyGroup>
 
-    <Error Text="Unable to find precompiled view file $(ExpectedOutputFile)"
-      Condition="!Exists('$(ExpectedOutputFile)')" />
+    <Error Text="Unable to find precompiled view file $(ExpectedOutputFile)" Condition="!Exists('$(ExpectedOutputFile)')" />
   </Target>
     
 </Project>