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diff --git a/guidelines/cs.rst b/guidelines/cs.rst
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@@ -0,0 +1,50 @@
+====
+ C#
+====
+
+C# is to be created using respective Visual Studio Project templates.
+Usage of a strict pattern like *MVVM* or *MVC*.
+The respective usage is to be documented in the project you are using.
+
+Every class should be put into a separate file.
+This ensures assignability when creating `tests <Testing_>`_
+Feel free to add directories for a more concise structure of your project.
+
+---------------
+ Documentation
+---------------
+
+Since projects are not created using `copier` templates the documentation has to be added using the `copier-documentation <../copier-documentation>`_ template.
+
+Inline documentation can be added using `sphinx-autoapi <https://sphinx-autoapi.readthedocs.io/en/latest/tutorials.html#net>`_.
+
+.. TODO
+
+---------
+ Testing
+---------
+
+Testing is mandatory and has to be included in every commit.
+For *C#* `xUnit <https://xunit.net/>`_ is to be used.
+It is recommended to you `this extension <https://marketplace.visualstudio.com/items?itemName=YowkoTsai.xUnitnetTestGenerator>`_ to be able to easily add tests to your project.
+
+
+.. image:: /_static/images/visual_studio_create_unit_tests_context_menu.png
+    :align: left
+    :width: 40 %
+
+.. image:: /_static/images/visual_studio_create_unit_tests.png
+    :align: right
+    :width: 50 %
+
+
+The settings in :code:`Create Unit Tests` should not be changed.
+If a test project already exists for your respective code you should select it.
+
+For better readability of your tests use `FluentAssertions <https://github.com/fluentassertions/fluentassertions>`_.
+
+Mocks are created using `FakeItEasy <https://github.com/FakeItEasy/FakeItEasy>`_.
+
+Code coverage can not be checked using the Visual Studio Community edition, as this feature is only enabled for the `Visual Studio Enterprise <https://docs.microsoft.com/en-us/visualstudio/test/using-code-coverage-to-determine-how-much-code-is-being-tested?view=vs-2022>`_ edition.
+
+.. TODO Maybe code coverage can be checked using github actions?
diff --git a/index.rst b/index.rst
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--- a/index.rst
+++ b/index.rst
@@ -7,6 +7,8 @@
    :maxdepth: 2
    :caption: Contents:
 
+   guidelines/cs.rst
+
 
 ----------
  Projects