Improve CS0119 error documentation with specific guidance for Type collections

[Copilot]

Enhanced the CS0119 compiler error documentation to address user feedback about uninstructive error messages when working with collections of types.

Problem

Users encountering CS0119 when trying to create List<Type> collections found the existing documentation too generic and unhelpful. The original issue described a scenario where a developer attempted:

List<Type> pageTypesList = new List<Type>();
pageTypesList.Add(Page_BaseClass); // CS0119 error

The existing documentation only provided a generic example about method/class naming conflicts, leaving developers without clear guidance on how to properly work with type collections.

Solution

Added a comprehensive Example 2 that specifically demonstrates:

1. The Problem: Shows the exact error scenario when trying to add class names directly to List<Type>
2. Primary Solution: Demonstrates correct usage with the typeof() operator
3. Alternative Approach: Provides an additional method for dynamic type loading using Type.GetType()

The new example includes:

• Complete, compilable code samples
• Clear error explanations with inline comments
• Proper using statements and modern C# conventions
• Cross-references to relevant API documentation

Impact

Developers encountering CS0119 in this common scenario will now have:

• Clear understanding of why the error occurs
• Multiple concrete solutions to resolve it
• Guidance on both compile-time and runtime type collection patterns

Fixes #26433.

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

---

Internal previews

📄 File	🔗 Preview link
docs/csharp/misc/cs0119.md	docs/csharp/misc/cs0119

[BillWagner]

This LGTM as well.