Double navigation bar when visual studion

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Double navigation bar when visual studion

Search Tech 20

I have reinstalled the visual studio 2022 and pulled the head branch which is working as expected in another device which is the same branch. After the reinstallation of visual studio, the project is running but showing the two navigation bar in the same branch.. I have cloned the project and compiled but the issue is not fixed.. Is there any technical while running the project after reinstallation.. please give me the quick fixes asap..
image (2)

Search Tech 20 Reputation points

2025-10-16T11:24:03.6833333+00:00
Align SDK/runtime versions (dotnet SDKs) and Visual Studio workloads.

What will be the difference in the SDK version. I have uninstalled SDK version 7 and reinstall SDK version 8. It works as expected. But can you tell me how it works to avoid the future issues?

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Search Tech 20 Reputation points

2025-10-16T11:24:03.6833333+00:00

Align SDK/runtime versions (dotnet SDKs) and Visual Studio workloads.

What will be the difference in the SDK version. I have uninstalled SDK version 7 and reinstall SDK version 8. It works as expected. But can you tell me how it works to avoid the future issues?

Answer 1

Thank you for reaching out.

After reinstalling Visual Studio, your app likely started running under a different environment/profile (e.g., Development vs Production) or picked up stale local artifacts (IIS Express/.vs/NuGet caches). Those changes can expose a duplicate layout/partial or load both dev and prod assets, which renders the navbar twice.

Clean local artifacts

Close Visual Studio.
Delete: .vs/, bin/, obj/, and node_modules/ (if present).
Clear NuGet caches.
Clear IIS Express caches (if you run with IIS Express).
Reopen Visual Studio, restore, and rebuild.
Test in a private/incognito browser window to avoid stale JS/CSS.

Why it helps: Old bundled assets and IIS Express profile files often cause duplicated UI rendering after a reinstall.

Check layout duplication

Ensure the navbar is defined only once in your app’s primary layout.
Confirm no page/screen/component also adds its own navbar.
Watch for nested layouts (parent + child both add a navbar).
Use browser DevTools to inspect the DOM and locate both <nav> elements; identify their source (layout vs page vs component).

Why it helps: Reinstall can switch your run profile or environment, exposing a second layout path you didn’t notice earlier.

Match the environment to the “good” machine

Compare ASPNETCORE_ENVIRONMENT between both machines (Development vs Production).
If you have dev-only UI (debug headers/toolbars/secondary nav), disable or align the environment.
Check for feature flags (e.g., “ShowSecondaryNav”, “EnableDebugShell”) in environment-specific settings and set them consistently.

Why it helps: Many teams show extra UI only in Development; a reinstall may have flipped your profile.

Verify run profile and hosting choice

Run using the Project profile instead of IIS Express (or vice versa) to test.
Recreate the IIS Express profile if needed.
Ensure the correct startup project and launch settings are selected.

Why it helps: Different profiles load different layouts, static roots, or middleware that can double-render nav.

Prevent double inclusion from bundles/static files

Ensure only one set of scripts/styles loads for the current environment.
Confirm you’re not serving old static files alongside framework-rendered UI.
If you publish locally, clean the output folder before re-publishing.

Why it helps: Loading both dev and prod bundles or mixing old and new assets can duplicate navbar logic.

Compare with the working machine

Align SDK/runtime versions (dotnet SDKs) and Visual Studio workloads.
Diff these files: launch settings, project file (especially content/static includes), and any user-specific settings (.user files).
Confirm identical build steps (npm, bundlers) and folder structures.

Why it helps: The same branch with different local config/build steps will render UI differently.

Quick decision rule

If both navbars appear visually identical, it’s likely layout + page/component duplication → remove one inclusion.
If they look different (e.g., one is a debug toolbar), it’s likely environment/profile → align to Production or disable debug UI.

Final validation

After fixes, full clean & rebuild again.
Test in incognito and a different browser to rule out cache.
If hosted, clear the publish destination and redeploy.

Let me know if you need any further help with this. We'll be happy to assist.

If you find this helpful, please mark this as answered.

Search Tech 20 Reputation points

2025-10-16T11:24:51.74+00:00

Align SDK/runtime versions (dotnet SDKs) and Visual Studio workloads.

What will be the difference in the SDK version. I have uninstalled SDK version 7 and reinstall SDK version 8. It works as expected. But can you tell me how it works to avoid the future issues?
Search Tech 20 Reputation points

2025-10-16T11:25:50.12+00:00

Align SDK/runtime versions (dotnet SDKs) and Visual Studio workloads.

What will be the difference in the SDK version. I have uninstalled SDK version 7 and reinstall SDK version 8. It works as expected. But can you tell me how it works to avoid the future issues?
Varsha Dundigalla(INFOSYS LIMITED) 2,700 Reputation points Microsoft External Staff

2025-10-16T12:08:13.0566667+00:00

Thank you for reaching out.

When you upgraded from .NET 7 to .NET 8, you effectively changed the runtime and build pipeline that Visual Studio uses for your project. Each SDK version brings updates to the Razor engine, layout rendering, static file handling, and environment configuration logic. If your project was built or restored under .NET 8 on another machine, but your local machine was still using .NET 7, subtle differences in how layouts, tag helpers, or environment conditions are processed could cause duplicate UI elements like navbars.

For example:

Tag Helpers and Environment Conditions: .NET 8 may optimize or change how <environment> tags or conditional rendering works compared to .NET 7.

Static Asset Handling: Bundling/minification and cache-busting strategies can differ between SDK versions, leading to duplicate script/style inclusion.

Framework Features: New SDKs sometimes introduce default behaviors (e.g., layout nesting or component rendering) that older SDKs don’t interpret the same way.

How to avoid future issues:

Keep SDK versions consistent across all machines (use global.json in your repo to lock the SDK version).

Check Target Framework in your .csproj (e.g., net8.0) and ensure it matches the installed SDK.

Update Visual Studio workloads when upgrading SDKs to ensure tooling aligns with the runtime.

Run dotnet --info on all machines to confirm the same SDK and runtime versions.

Let me know if you need any further help with this. We'll be happy to assist.
Varsha Dundigalla(INFOSYS LIMITED) 2,700 Reputation points Microsoft External Staff

2025-10-17T12:54:13.4066667+00:00

Thank you for your response. We will now proceed with closing the thread as per your confirmation. If you encounter any further issues, please feel free to raise a new thread.

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Double navigation bar when visual studion

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