Move ConfigureDbContext sample code to main project and remove separate sample directory

Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

Author: Copilot

entity-framework/core/dbcontext-configuration/index.md

@@ -112,7 +112,7 @@ Starting with EF Core 9.0, you can use <xref:Microsoft.Extensions.DependencyInje
 
         var serviceProvider = services.BuildServiceProvider();
 -->
-[!code-csharp[BasicConfigureDbContext](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/Program.cs?name=BasicConfigureDbContext)]
+[!code-csharp[BasicConfigureDbContext](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample.cs?name=BasicConfigureDbContext)]
 
 ### Provider-specific configuration without connection strings
 
@@ -130,7 +130,7 @@ To apply provider-specific configuration you can use provider-specific configura
 
         var serviceProvider = services.BuildServiceProvider();
 -->
-[!code-csharp[ProviderSpecificConfiguration](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/Program.cs?name=ProviderSpecificConfiguration)]
+[!code-csharp[ProviderSpecificConfiguration](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample.cs?name=ProviderSpecificConfiguration)]
 
 ### ConfigureDbContext and AddDbContext precedence
 
@@ -152,7 +152,7 @@ For non-conflicting options (like adding logging, interceptors, or other setting
 
         var serviceProvider = services.BuildServiceProvider();
 -->
-[!code-csharp[ConfigurationComposition](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/Program.cs?name=ConfigurationComposition)]
+[!code-csharp[ConfigurationComposition](../../../samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample.cs?name=ConfigurationComposition)]
 
 For conflicting options, the last configuration wins. See [breaking changes in EF Core 8.0](xref:core/what-is-new/ef-core-8.0/breaking-changes#AddDbContext) for more information about this behavior change.
 

…text/ConfigureDbContextSample/Program.cs …ingDbContext/ConfigureDbContextSample.cssamples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/Program.cs renamed to samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample.cs samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/Program.cs renamed to samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample.cs

@@ -1,3 +1,5 @@
+#nullable enable
+
 using System;
 using System.Linq;
 using Microsoft.EntityFrameworkCore;
@@ -21,9 +23,9 @@ public class Blog
     public string? Content { get; set; }
 }
 
-public class Program
+public static class ConfigureDbContextExamples
 {
-    public static void Main(string[] args)
+    public static void Run()
     {
         BasicConfigureDbContextExample();
         ProviderSpecificConfigurationExample();

samples/core/Miscellaneous/ConfiguringDbContext/ConfigureDbContextSample/ConfigureDbContextSample.csproj

@@ -10,7 +10,10 @@
         <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.0" />
         <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.0" />
         <PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="8.0.0" />
-        <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.0" />
+        <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.0" />
+        <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.0" />
+        <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.0" />
+        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
     </ItemGroup>
 
 </Project>