A type name matches one of the following namespace names in a case-insensitive comparison:

• Collections

• Forms

• System

• UI

Type names should not match the names of namespaces defined in the .NET Framework class library. Violating this rule can reduce the usability of the library.

Select a type name that does not match the name of a .NET Framework class library namespace.

For new development, there are no known scenarios where you must suppress a warning from this rule. For shipping libraries, you might have to suppress a warning from this rule.