CA1822: Document MarshalByRefObject as an exception to the static-member rule (#52763)

Author: Copilot

docs/fundamentals/code-analysis/quality-rules/ca1822.md

@@ -1,7 +1,8 @@
 ---
 title: "CA1822: Mark members as static (code analysis)"
 description: "Learn about code analysis rule CA1822: Mark members as static"
-ms.date: 11/04/2016
+ms.date: 03/30/2026
+ai-usage: ai-assisted
 f1_keywords:
 - MarkMembersAsStatic
 - CA1822
@@ -41,7 +42,10 @@ Mark the member as static (or Shared in Visual Basic) or use 'this'/'Me' in the
 
 ## When to suppress warnings
 
-It is safe to suppress a warning from this rule for previously shipped code for which the fix would be a breaking change.
+It's safe to suppress a warning from this rule in the following cases:
+
+- For previously shipped code for which the fix would be a breaking change.
+- For methods in classes that inherit from <xref:System.MarshalByRefObject>. The methods in these classes shouldn't be marked as static, because the .NET remoting infrastructure uses instance dispatch to forward calls across AppDomain boundaries. Making such methods static can break remoting across AppDomain boundaries.
 
 ## Suppress a warning