Add info on extention methods

docs/ide/reference/intellisense-completion-unimported-types-and-extension-methods.md

@@ -0,0 +1,41 @@
+---
+title: IntelliSense completion for unimported types and extension methods
+description: How to use IntelliSense completion for types and extension methods that you haven't imported yet with a `using` directive.
+ms.date: 03/10/2020
+ms.topic: reference
+author: mikadumont
+ms.author: midumont
+manager: jillfra
+dev_langs:
+  - CSharp
+  - VB
+
+ms.workload: 
+  - "dotnet"
+---
+# IntelliSense completion for unimported types and extension methods
+
+This refactoring applies to:
+
+- C#
+
+- Visual Basic
+
+**What:** IntelliSense gives completion for unimported types and extension methods.
+
+**When:** You want to use a type or extension methods that already has a dependency in your project but the import statement has not yet been added to your file. 
+
+**Why:** You don't have to manually add the import statement to your file.
+
+## How-to
+
+1. Once you start typing the name of a type or extension method that has a dependency in your project, IntelliSense will give you suggestions.
+2. Press **Tab**. 
+
+   The import statement will be added to your file.
+
+   ![IntelliSense completion for unimported types](media/intellisense-completion-unimported-types.png)
+
+## See also
+
+- [Refactoring](../refactoring-in-visual-studio.md)

docs/toc.yml

@@ -402,8 +402,8 @@
           href: ide/reference/extract-local-function.md
         - name: Inline temporary variable
           href: ide/reference/inline-temporary-variable.md
-        - name: IntelliSense completion unimported types
-          href: ide/reference/intellisense-completion-unimported-types.md
+        - name: IntelliSense completion unimported types and extension methods
+          href: ide/reference/intellisense-completion-unimported-types-and-extension-methods.md
         - name: Invert conditional expressions and logical operations
           href: ide/reference/invert-conditional-logical.md
         - name: Invert if statement