update migration guide

Author: wenxi-zeng

src/connections/sources/catalog/libraries/server/csharp/index.md

@@ -27,7 +27,7 @@ These platforms support Analytics-CSharp:
 ## Getting started
 
 > info ""
-> If you'd like to migrate to Analytics-CSharp from a different library, follow the steps in the [Analytics-CSharp migration guide](/docs/connections/sources/catalog/libraries/server/csharp/migration-guide/). 
+> If you'd like to migrate to Analytics-CSharp from Analytics.NET or Analytics.Xamarin, follow the steps in the [Analytics-CSharp migration guide](/docs/connections/sources/catalog/libraries/server/csharp/migration-guide/). 
 
 To get started with the Analytics-CSharp library: 
 

src/connections/sources/catalog/libraries/server/csharp/migration-guide.md

@@ -8,7 +8,7 @@ If you’re currently using Analytics.NET or Analytics.Xamarin to send data to S
 You can update to Analytics-CSharp in 3 easy steps
 1. Bundle Analytics-CSharp into your app (and remove your previous SDK)
 2. Change the namespaces
-3. Advanced: Run Analytics in Synchronous Mode
+3. (Optional) Use `Reset` to stay anonymous
 
 
 ## Start the Migration
@@ -46,33 +46,33 @@ You can update to Analytics-CSharp in 3 easy steps
         using Segment.Analytics.Compat;
       ```
 
-## Optional Changes
-
-1. Change your development settings if you would like to make analytics run synchronously for testing purposes. 
+3. (Optional) Update calls that resets anonymous ID. 
+   
+   The old SDK requires you to provide anouymous ID. In the new SDK, it generates an Anonymous ID for you if you never call `analytics.Identify`. If you've called `Identify` and want to go back to anonymous, the new SDK provides a `Reset` function to acheive that.
 
     <br> Before:
     ```c#                  
-    Analytics.Initialize("YOUR_WRITE_KEY", new Config().SetAsync(false));
+    Analytics.Client.Page(null, "Login", new Properties(), new Options()
+    .SetAnonymousId("some-id"));
     ```
 
     <br> After:
     ```c#                  
-    var configuration = new Configuration("YOUR WRITE KEY",
-        useSynchronizeDispatcher: true);
-    var analytics = new Analytics(configuration);
+    analytics.Reset();
     ```
 
-2. Review your anonymous ID settings. 
+## Optional Changes for Unit Tests
+
+1. Change your development settings if you would like to make analytics run synchronously for testing purposes. 
 
     <br> Before:
     ```c#                  
-    Analytics.Client.Page(null, "Login", new Properties(), new Options()
-    .SetAnonymousId("some-id"));
+    Analytics.Initialize("YOUR_WRITE_KEY", new Config().SetAsync(false));
     ```
 
-    The new SDK by default, generates an Anonymous ID for you if you never call `analytics.Identify`. If you've called `Identify` and want to go back to anonymous, try:
-
     <br> After:
     ```c#                  
-    analytics.Reset();
+    var configuration = new Configuration("YOUR WRITE KEY",
+        useSynchronizeDispatcher: true);
+    var analytics = new Analytics(configuration);
     ```