Fix VB type mismatch in DataGrid SQL EF walkthrough and migrate snippets

[Copilot]

Summary

Fixes Visual Basic compilation error where dataEntities.Products returns DbSet(Of Product) but code attempted to cast to ObjectQuery(Of Product). Migrates code snippets from legacy location to current standard.

Fixes #2077

Bug Fix

Before (broken):

Imports System.Data.Objects
Dim products As ObjectQuery(Of Product) = dataEntities.Products  ' Type mismatch error
Dim query = From product In products ...

After (fixed):

Imports System.Linq
Dim query = From product In dataEntities.Products ...  ' Type inference handles DbSet correctly

Migration

• Moved snippets from ~/samples/snippets/ to ./snippets/walkthrough-display-data-from-a-sql-server-database-in-a-datagrid-control/framework/
• Updated article references from legacy [!code-...] to modern :::code...::: syntax
• Replaced numeric snippet IDs (#2) with descriptive identifiers (LoadDataFromDatabase)
• Created SDK-style project files targeting .NET Framework 4.8
• Improved C# LINQ query formatting with proper indentation for better readability
• Removed 31 legacy files after confirming no other articles reference them

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

---

Internal previews

📄 File	🔗 Preview link
dotnet-desktop-guide/wpf/controls/walkthrough-display-data-from-a-sql-server-database-in-a-datagrid-control.md	dotnet-desktop-guide/wpf/controls/walkthrough-display-data-from-a-sql-server-database-in-a-datagrid-control

[Copilot]

Pull Request Overview

This PR fixes a Visual Basic compilation error in a WPF DataGrid SQL Entity Framework walkthrough and migrates code snippets to the current standard location. The type mismatch occurred because dataEntities.Products returns ObjectSet(Of Product) (not DbSet), but the code attempted to cast it to ObjectQuery(Of Product).

Key changes:

• Fixed VB type mismatch by removing unnecessary intermediate variable and using LINQ directly on the entity set
• Migrated snippets from ~/samples/snippets/ to ./snippets/walkthrough-display-data-from-a-sql-server-database-in-a-datagrid-control/framework/
• Updated documentation to use modern :::code::: syntax instead of legacy [!code-...] syntax
• Replaced numeric snippet IDs with descriptive identifiers
• Created SDK-style project files targeting .NET Framework 4.8

Reviewed Changes

Copilot reviewed 21 out of 35 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
walkthrough-display-data-from-a-sql-server-database-in-a-datagrid-control.md	Updated snippet references to new location and modern syntax
MainWindow.xaml.vb	Fixed type mismatch by removing ObjectQuery cast and using direct LINQ query
MainWindow.xaml.cs	Updated import statements and improved LINQ query indentation
MainWindow.xaml (C# and VB)	Added complete XAML files with updated snippet markers
DataGridSQLExample.csproj/vbproj	Created SDK-style project files for both languages
App.xaml, App.Config, Application.xaml	Added supporting application files
AdventureWorksModel.edmx, Designer files	Added Entity Framework model files
Legacy files	Removed 31 legacy files from old snippet location

Files not reviewed (4)

• dotnet-desktop-guide/samples/snippets/csharp/VS_Snippets_Wpf/DataGrid_SQL_EF_Walkthrough/CS/Properties/Resources.Designer.cs: Language not supported
• dotnet-desktop-guide/samples/snippets/csharp/VS_Snippets_Wpf/DataGrid_SQL_EF_Walkthrough/CS/Properties/Settings.Designer.cs: Language not supported
• dotnet-desktop-guide/samples/snippets/visualbasic/VS_Snippets_Wpf/DataGrid_SQL_EF_Walkthrough/VB/My Project/Resources.Designer.vb: Language not supported
• dotnet-desktop-guide/samples/snippets/visualbasic/VS_Snippets_Wpf/DataGrid_SQL_EF_Walkthrough/VB/My Project/Settings.Designer.vb: Language not supported

[BillWagner]

This LGTM @adegeo

Let's