Revert "TEMP: remove C# from changestreams"

This reverts commit ec40086.

Author: kay-kim

source/tutorial/change-streams-example.txt

@@ -24,6 +24,7 @@ Change Stream Examples
 
 
 
+
 .. contents:: On this page
    :local:
    :backlinks: none
@@ -47,6 +48,12 @@ Change Stream Examples
          <http://mongodb.github.io/mongo-java-driver/3.6/driver/tutorials/databases-collections/>`_
          that contains an ``inventory`` collection.
 
+     - id: csharp
+       content: |
+          The examples below assume that you have `connected to a MongoDB replica set and have accessed a database
+          <http://mongodb.github.io/mongo-csharp-driver/2.4/getting_started/quick_tour/#make-a-connection/>`_  
+          that contains an ``inventory`` collection.
+  
      - id: c
        content: |
          The examples below assume that you have `connected to a MongoDB replica set and have accessed a database
@@ -85,6 +92,15 @@ as long as a connection to the MongoDB deployment remains open *and* the collect
             :dedent: 8
             :start-after: Start Changestream Example 1
             :end-before: End Changestream Example 1
+
+     - id: csharp
+       content: |
+         .. class:: copyable-code
+         .. literalinclude:: /driver-examples/ChangeStreamExamples.cs
+            :language: c#
+            :dedent: 12
+            :start-after: Start Changestream Example 1
+            :end-before: End Changestream Example 1
 
      - id: c
        content: |
@@ -131,6 +147,13 @@ Lookup Full Document for Update Operations
          To return the most current majority-committed version of the updated
          document, pass the ``"fullDocument"`` option with the ``"updateLookup"`` value to the
          :method:`mongoc_collection_watch` method. 
+      
+     - id: csharp
+       content: |
+         By default, change streams only return the delta of fields during the update operation. 
+         To return the most current majority-committed version of the updated
+         document, pass ``"FullDocument = ChangeStreamFullDocumentOption.UpdateLookup"`` to the
+         :method:`collection.Watch()` method. 
 
 
 If there are one or more majority-committed operations that modified the
@@ -170,6 +193,16 @@ update operation.
             :dedent: 8
             :start-after: Start Changestream Example 2
             :end-before: End Changestream Example 2
+
+     - id: csharp
+       content: |
+         .. class:: copyable-code
+         
+         .. literalinclude:: /driver-examples/ChangeStreamExamples.cs
+            :language: C#
+            :dedent: 12
+            :start-after: Start Changestream Example 2
+            :end-before: End Changestream Example 2
 
      - id: c
        content: |
@@ -281,6 +314,22 @@ notification after a specific notification.
             :dedent: 8
             :start-after: Start Changestream Example 3
             :end-before: End Changestream Example 3
+
+     - id: csharp
+       content: |
+         In the example below, the ``resumeToken`` is retrieved from the last change stream document
+         and passed to the ``Watch()`` method as an option. Passing the ``resumeToken`` 
+         to the ``Watch()`` method directs
+         the change stream to attempt to resume notifications starting at the
+         operation specified in the resume token.
+         
+         .. class:: copyable-code
+         
+         .. literalinclude:: /driver-examples/ChangeStreamExamples.cs
+            :language: C#
+            :dedent: 12
+            :start-after: Start Changestream Example 3
+            :end-before: End Changestream Example 3
 
      - id: c
        content: |