.NET samples update for 03-Getting-Started

[justinyoo]

Purpose

Describe the intention of the changes being proposed. What problem does it solve or functionality does it add?

I've reviewed the .NET sample apps under 03-GettingStarted and fixed some errors.

More reviews will come for 04-10

Does this introduce a breaking change?

When developers merge from main and run the server, azd up, or azd deploy, will this produce an error?
If you're not sure, try it out on an old environment.

[ ] Yes
[x] No

Does this require changes to learn.microsoft.com docs or modules?

which includes deployment, settings and usage instructions.

[ ] Yes
[x] No

Type of change

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[x] Other... Please describe: .NET SDK version update + missing sample app added

[Copilot]

Pull Request Overview

This PR updates the .NET samples under 03-GettingStarted to target .NET 9.0, modernizes package references, adds missing launch/solution files, and fixes sample app errors.

• Upgraded target frameworks to net9.0 and switched to wildcard package versions
• Added missing launchSettings.json for HTTP streaming and solution files for SSE and other samples
• Refactored Program/README files to fix transport setup, async patterns, and restore/run steps

Reviewed Changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
03-GettingStarted/06-http-streaming/solution/dotnet/Properties/launchSettings.json	Added launch settings for HTTP streaming
03-GettingStarted/06-http-streaming/solution/dotnet/Program.cs	Configured MCP server with HTTP transport
03-GettingStarted/05-sse-server/solution/dotnet/server.sln	Added solution file for SSE server sample
03-GettingStarted/05-sse-server/solution/dotnet/server.csproj	Updated to net9.0 and wildcard package reference
03-GettingStarted/05-sse-server/solution/dotnet/Tools.cs	Cleaned up constructor and awaited Task.FromResult
03-GettingStarted/05-sse-server/solution/dotnet/README.md	Fixed install step and added SSE selection note
03-GettingStarted/05-sse-server/solution/dotnet/Program.cs	Configured MCP server (SSE sample)
03-GettingStarted/04-vscode/solution/README.md	Added <details> snippets for Node.js and .NET setups
03-GettingStarted/03-llm-client/solution/dotnet/dotnet.sln	Added solution file for LLM client sample
03-GettingStarted/03-llm-client/solution/dotnet/dotnet.csproj	Upgraded to net9.0 and wildcard package references
03-GettingStarted/03-llm-client/solution/dotnet/README.md	Improved PAT environment setup instructions
03-GettingStarted/03-llm-client/solution/dotnet/Program.cs	Added token check, path interpolation, and C#12 syntax
03-GettingStarted/02-client/solution/server/server.csproj	Upgraded to net9.0 and wildcard package references
03-GettingStarted/02-client/solution/dotnet/dotnet.sln	Added solution file for client sample
03-GettingStarted/02-client/solution/dotnet/dotnet.csproj	Upgraded to net9.0 and wildcard package references
03-GettingStarted/02-client/solution/dotnet/README.md	Added restore/run instructions
03-GettingStarted/02-client/solution/dotnet/Program.cs	Refactored transport path and removed unused usings
03-GettingStarted/01-first-server/solution/dotnet/dotnet.sln	Added solution file for first-server sample
03-GettingStarted/01-first-server/solution/dotnet/dotnet.csproj	Upgraded to net9.0 and wildcard package references
03-GettingStarted/01-first-server/solution/dotnet/README.md	Simplified install step to dotnet restore

Comments suppressed due to low confidence (2)

03-GettingStarted/05-sse-server/solution/dotnet/Program.cs:12

• After building the app, you need to map endpoints and call app.Run();. Add app.MapMcp("/mcp"); and app.Run(); to start the server.

var app = builder.Build();

03-GettingStarted/02-client/solution/dotnet/Program.cs:1

• The code references StdioClientTransport but the ModelContextProtocol.Protocol.Transport namespace was removed. Add using ModelContextProtocol.Protocol.Transport; to resolve this type.

using Microsoft.Extensions.Configuration;