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<div class="max-w-3xl mx-auto px-4 sm:px-6 lg:px-8">
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<div class="flex items-center gap-2 mb-3"><span class="text-xs font-semibold bg-amber-50 text-amber-700 border border-amber-200 rounded-full px-2.5 py-0.5">VSA</span><span class="text-xs text-gray-400">June 2026 · 8 min read</span></div>
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<h1 class="text-3xl sm:text-4xl font-extrabold text-gray-900 mb-4">Introduction to Vertical Slice Architecture in .NET 10</h1>
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<div class="bg-green-50 border border-green-200 rounded-xl p-4 mb-8">
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<p class="text-sm text-green-800 font-semibold mb-1">TL;DR</p>
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<p class="text-sm text-green-700">Vertical Slice Architecture organizes code by business features instead of technical layers. In .NET 10, you can define an entire feature — endpoint, DTOs, validation, and handler — in <strong>a single C# file</strong>. This maximizes cohesion, reduces cognitive overhead, and lets you add features without touching 7 different projects.</p>
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</div>
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<article>
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<p>Vertical Slice Architecture (VSA) is a software design approach that organizes code by business features rather than technical layers. In a traditional layered architecture, implementing a "Create Order" feature means working across <code>Controllers/</code>, <code>Services/</code>, <code>Repositories/</code>, <code>Domain/</code>, and <code>DTOs/</code> — often spread across 5+ separate projects. VSA flips this on its head: everything for "Create Order" lives in one folder, one file, or at most a small cluster of files within a single project.</p>
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<h2>Why VSA Matters in .NET 10</h2>
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<p>.NET 10's Minimal APIs make VSA more natural than ever. You can define an entire feature — endpoint, request/response DTOs, validation, and handler logic — in a single C# file using top-level statements and MediatR. The result is maximum cohesion: everything you need to understand a feature is in one place. No more jumping between 7 projects in Solution Explorer just to trace a single user action.</p>
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<h3>Key Benefits</h3>
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<ul>
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<li><strong>Maximum Cohesion:</strong> All code for a feature lives together. When you need to modify "Create Order," you open one file.</li>
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<li><strong>Faster Onboarding:</strong> New developers understand a feature by reading a single file, not tracing through 5 projects.</li>
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<li><strong>Reduced Merge Conflicts:</strong> Teams working on different features rarely touch the same files.</li>
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<li><strong>Easier Testing:</strong> Each slice is self-contained and can be tested in isolation.</li>
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</ul>
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<h2>A Concrete Example</h2>
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<pre>// Features/Orders/CreateOrder.cs
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public static class CreateOrderEndpoint
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{
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public static void Map(IEndpointRouteBuilder app) =>
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app.MapPost("/api/orders", async (CreateOrderCommand cmd, IMediator m) =>
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Results.Ok(await m.Send(cmd)));
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}
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public record CreateOrderCommand(string CustomerId, List<OrderItem> Items) : IRequest<OrderDto>;
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public class CreateOrderHandler : IRequestHandler<CreateOrderCommand, OrderDto>
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{
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readonly AppDbContext _db;
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public CreateOrderHandler(AppDbContext db) => _db = db;
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public async Task<OrderDto> Handle(CreateOrderCommand cmd, CancellationToken ct)
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{
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var order = Order.Create(cmd.CustomerId, cmd.Items);
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_db.Orders.Add(order);
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await _db.SaveChangesAsync(ct);
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return OrderDto.FromEntity(order);
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}
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}</pre>
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<p>That's it. One file contains the API endpoint, the command, the handler, and the result DTO. When you need to modify how orders are created, you open this file. When a new developer joins, they read this file and understand the entire flow. This is the power of VSA.</p>
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<h2>Key Takeaways</h2>
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<ul>
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<li>VSA organizes by <strong>business capability</strong>, not technical concern</li>
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<li>.NET 10 Minimal APIs + MediatR make VSA natural and concise</li>
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<li>Every Indotalent product uses this architecture — study real production code</li>
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<li>One file = one feature = zero confusion</li>
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</ul>
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</article>
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<p class="text-sm text-gray-700 font-semibold mb-2">Ready to study real VSA code?</p>
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<p class="text-sm text-gray-600 mb-4">Every Indotalent product is a complete .NET 10 application built with Vertical Slice Architecture. Complete source code — $21 each.</p>
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