Fix inconsistent lambda parameter in DepartmentsController Edit snippets

[Copilot]

The snippet_EagerLoading and snippet_EditPost code snippets in DepartmentsController.cs used i as the lambda parameter for .Include(), inconsistent with the rest of the controller which uses d. Readers copying these snippets into surrounding context would encounter confusing mismatches.

Changes

• DepartmentsController.cs — Renamed lambda parameter i → d in two places:
  • snippet_EagerLoading (HttpGet Edit)
  • snippet_EditPost (HttpPost Edit)

// Before
var department = await _context.Departments
    .Include(i => i.Administrator)
    .AsNoTracking()
    .FirstOrDefaultAsync(m => m.DepartmentID == id);

// After
var department = await _context.Departments
    .Include(d => d.Administrator)
    .AsNoTracking()
    .FirstOrDefaultAsync(m => m.DepartmentID == id);

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update Edit methods</issue_title>
<issue_description>
Under the Update Edit method, if someone copies and pates the section for adding .AsNoTracking() they will run into errors. Consider updating the v5 instructions to show:

var department = await _context.Departments .Include(d => d.Administrator) .AsNoTracking() .FirstOrDefaultAsync(m => m.DepartmentID == id);

Differences are seen in the Administrator line. The istructions show i=> i.Administrator, but at this point of the tutorial, it shows a d=>.

The tutorial code seems to come maybe from the instructorcontroller class, which might throw some people off.

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 6081e36d-a501-324b-3d5a-e0554658d301
• Version Independent ID: 232ef04e-563a-86b4-e397-1359bb5579ca
• Content: Tutorial: Handle concurrency - ASP.NET MVC with EF Core
• Content Source: aspnetcore/data/ef-mvc/concurrency.md
• Product: aspnet-core
• Technology: aspnetcore-data
• GitHub Login: @Rick-Anderson
• Microsoft Alias: riande</issue_description>

<agent_instructions>Review all discussion in this issue. The discussion includes a triage report that suggest a plan for the resolution of this issue. Consider that plan carefully before forming your own plan.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@wadepickett ## 🤖 AI Triage Summary

📌 Note to community: This is an automated preliminary analysis to help our documentation team quickly review, determine scope and prioritize this issue. This report is not a resolution or answer to your question—it's an internal triage tool that identifies potentially relevant docs, code samples, and versions to look into. A team member will review this issue and respond. Thank you for your contribution!

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This preliminary assessment report was run by: @wadepickett
Date: 2026-02-24
Issue: 20667
Model: GitHub Copilot

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Issue Analysis: Inconsistent Lambda Parameter Name in "Update Edit Methods" Code Snippet

✅ Issue Validation

Status: Valid and actionable

📋 Issue Summary

The "Update Edit methods" section of the EF Core MVC concurrency tutorial uses inconsistent lambda parameter names in the DepartmentsController.cs code sample. The snippet_EagerLoading snippet (used for the HttpGet Edit method) uses .Include(i => i.Administrator) with i as the lambda parameter, while the rest of the DepartmentsController (e.g., Index, Delete) consistently uses d (e.g., .Include(d => d.Administrator)). This inconsistency can confuse tutorial readers who copy-paste the code, since the surrounding context uses d and the snippet switches to i without explanation. The same inconsistency is present in the HttpPost Edit method (snippet_EditPost) at line 138.

A follow-up comment from the issue author also asks whether the intent is to replace the entire var department line with the provided code or just add .AsNoTracking(), suggesting the tutorial's wording could be clearer.

📁 Potentially Affected Files

These files have been identified as possibly related to this issue and may need review.

File	Path	Lines	Section
Main article	aspnetcore/data/ef-mvc/concurrency.md	142-146	"Update Edit methods"
Code sample	aspnetcore/data/ef-mvc/intro/samples/cu/Controllers/DepartmentsController.cs	111-116	snippet_EagerLoading (HttpGet Edit)
Code sample	aspnetcore/data/ef-mvc/intro/samples/cu/Controllers/DepartmentsController.cs	128-207	snippet_EditPost (HttpPost Edit)

📝 Preliminary Change Assessment

The following are initial observations for the documentation team to evaluate—not final decisions.

Potential Code Sample Update #1: snippet_EagerLoading (HttpGet Edit)

File: [aspnetcore/data/ef-mvc/intro/samples/cu/Controllers/DepartmentsController.cs](https://github.com/dotnet/AspNetCore.Docs/blob/3991a37d67aa1986ed119f05fdc5ab9be13c64d7...

• Fixes Update Edit methods #20667

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[wadepickett]

Approved, after making changes.