Update Environment Tag Helper docs (#3794)

* Update Environment Tag Helper docs

* Update EnvironmentTagHelper.md

aspnetcore/mvc/views/tag-helpers/built-in/EnvironmentTagHelper.md

@@ -1,20 +1,19 @@
----
-title: Environment Tag Helper | Microsoft Docs
+---
+title: Environment Tag Helper in ASP.NET Core
 author: pkellner
 description: ASP.Net Core Environment Tag Helper defined including all properties
 keywords: ASP.NET Core,tag helper
 ms.author: riande
 manager: wpickett
-ms.date: 02/14/2017
+ms.date: 07/14/2017
 ms.topic: article
-ms.assetid: c045d485-d1dc-4cea-a675-46be83b7a035
 ms.technology: aspnet
 ms.prod: aspnet-core
 uid: mvc/views/tag-helpers/builtin-th/EnvironmentTagHelper
 ---
-# Environment Tag Helper
+# Environment Tag Helper in ASP.NET Core
 
-By [Peter Kellner](http://peterkellner.net) 
+By [Peter Kellner](http://peterkellner.net) and [Hisham Bin Ateya](https://twitter.com/hishambinateya)
 
 The Environment Tag Helper conditionally renders its enclosed content based on the current hosting environment. Its single attribute `names` is a comma separated list of environment names, that if any match to the current environment, will trigger the enclosed content to be rendered.
 
@@ -34,6 +33,30 @@ An example of a valid `environment` tag helper is:
 </environment>
 ```
 
+## include and exclude attributes
+
+ASP.NET Core 2.x adds the `include` & `exclude` attributes. These attributes control rendering the  enclosed content based on the included or excluded hosting environment names.
+
+### include ASP.NET Core 2.0 and later
+
+The `include` property has a similar behavior of the `names` attribute in ASP.NET Core 1.0.
+
+```html
+<environment include="Staging,Production">
+  <strong>HostingEnvironment.EnvironmentName is Staging or Production</strong>
+</environment>
+```
+
+### exclude ASP.NET Core 2.0 and later
+
+In constract the `exclude` property let the `EnvironmentTagHelper` to render the enclosed content for all hosting environment names except the one(s) that you specified.
+
+```html
+<environment exclude="Development">
+  <strong>HostingEnvironment.EnvironmentName is Staging or Production</strong>
+</environment>
+```
+
 ## Additional resources
 
 * <xref:fundamentals/environments>