How to create Lexer/Parser?

[it19862]

Used:
Visual Studio - 2019

To install ANTLR I use - tunnelvisionlabs/antlr4cs // Github.com -

I took the grammar here - antlr/grammars-v4 // Github.com
CSharpLexer.g4
CSharpParser.g4
CSharpPreprocessorParser.g4

I did:

1. Installed ANTLR;
2. Created a WinFrom application;
3. Added grammar;
   Right-click the project or folder in Solution Explorer and select
   Add → Existing Element.

Question.
How to create Lexer/Parser?
The instructions say that additional classes should be created, but this does not happen.

[sharwell]

The build action for the grammars should be set to Antlr4. The additional files would then be created in the obj\Debug directory.