Add new sample.

Author: Nkrb

powerapps-docs/developer/common-data-service/build-tools-tasks.md

@@ -32,7 +32,7 @@ The Power Apps checker task runs a static analysis check on your solution(s) aga
 
 | **Parameters** | **Description** |
 | --- | --- |
-| Power Apps checker service  |   Select the service endpoint for Power Apps checker. The service   endpoint is defined under **Service Connections** in **Project Settings**.  **NOTE:** The service connection type that must be used for this specific task only is ‘Power Apps Checker,’ which is a service principals connection. More information on how to configure Service Principals before you can use the  task is available [here](build-tools-tasks#configure-service-connection-for-power-apps-checker).  |
+| Power Apps checker service  |   Select the service endpoint for Power Apps checker. The service   endpoint is defined under **Service Connections** in **Project Settings**.  **NOTE:** The service connection type that must be used for this specific task only is ‘Power Apps Checker,’ which is a service principals connection. More information on how to configure Service Principals before you can use the  task is available [here](#configure-service-connection-for-power-apps-checker).  |
 | Location of file to analyze  | Specify whether to reference a local file or a reference file from a Sas url. 
 | Local files to analyze/Sas uri for file to analyze |  Specify the path and file name of the zip files to analyze.   Wildcards can be used. For example, **\*.zip   for all zip files in all sub folders. You can choose to specify the files   directly or reference a File from a Sas uri.   |
 |  Rule set |   Specify which ruleset to apply. The following two rulesets are available:  **Solution Checker:** This is the same ruleset that is run from the [Maker Portal](https://make.powerapps.com/).    **AppSource:** This is the extended ruleset that is used to certify an application before it can be published to [AppSource](https://appsource.microsoft.com/).   |

powerapps-docs/developer/common-data-service/org-service/samples/query-metadata-changes.md

@@ -0,0 +1,51 @@
+---
+title: "Sample: Query and detect metadata changes (Common Data Service) | Microsoft Docs" # Intent and product brand in a unique string of 43-59 chars including spaces
+description: "This sample shows how to  query and detect metadata changes" # 115-145 characters including spaces. This abstract displays in the search result.
+ms.custom: ""
+ms.date: 05/08/2020
+ms.reviewer: "nabuthuk"
+ms.service: powerapps
+ms.topic: "article"
+author: "JimDaly" # GitHub ID
+ms.author: "jdaly" # MSFT alias of Microsoft employees only
+manager: "ryjones" # MSFT alias of manager or PM counterpart
+search.audienceType: 
+  - developer
+search.app: 
+  - PowerApps
+  - D365CE
+---
+
+# Query and detect metadata changes
+
+
+This sample shows how to retrieve and detect metadata changes using [RetrieveMetadataChangeRequest](https://docs.microsoft.com/dotnet/api/microsoft.xrm.sdk.messages.retrievemetadatachangesrequest?view=dynamics-general-ce-9) method. You can download the sample from [here](https://github.com/microsoft/PowerApps-Samples/tree/master/cds/orgsvc/C%23/MetadataQuery).
+
+## How to run this sample
+
+[!include[cc-how-to-run-samples](../../includes/cc-how-to-run-samples.md)]
+
+## What this sample does
+
+The `RetrieveMetadataChangeRequest` message is intended to be used in a scenario where it contains the data  that is needed to retrieve a collection of metadata records that satisfy the specified criteria. The [RetrieveMetadataChangesResponse](https://docs.microsoft.com/dotnet/api/microsoft.xrm.sdk.messages.retrievemetadatachangesresponse?view=dynamics-general-ce-9) returns a timestamp value that can be used with this request at a later time to return information about how metadata has changed since the last request.
+
+## How this sample works
+
+To simulate the scenario described in [What this sample does](#what-this-sample-does), the sample will do the following:
+
+### Setup
+
+Checks for the current version of the org.
+
+### Demonstrate
+
+1. The `MetadataFilterExpression` method creates the filter expression to limit entities returned to non-intersect, user-owned entities not found in the list of excluded entities. 
+2. The `MetadataConditionExpression` method returns the optionset attributes.
+3. The `MetadataPropertiesExpression` method limits the properties to be included with the attributes.
+4. The `LabelQueryExpression` method limits the labels returned to only those for user's preferred language.
+5. The `RetrieveMetadataChangeRequest` method retrieves the metadata for the query.
+
+
+### Clean up
+
+Display an option to delete the sample data that is created in [Setup](#setup). The deletion is optional in case you want to examine the entities and data created by the sample. You can manually delete the records to achieve the same result.

powerapps-docs/developer/component-framework/reference/paging.md

@@ -19,7 +19,7 @@ ms.assetid: 12891e96-972c-4289-bbde-2bc261cd1f12
 
 ## Available for 
 
-Model-driven apps
+Model-driven apps and canvas apps (public preview)
 
 ## Properties