1657389 Add descriptions for SEO (series of related PRs)

docs/csharp/programming-guide/concepts/linq/sorting-data.md

@@ -1,5 +1,6 @@
 ---
 title: "Sorting Data (C#)"
+description: Learn about sort operations and the standard query operator methods that perform sort operations in LINQ in C#.  
 ms.date: 07/20/2015
 ms.assetid: d93fa055-2f19-46d2-9898-e2aed628f1c9
 ---

docs/csharp/programming-guide/concepts/linq/standard-query-operators-overview.md

@@ -1,5 +1,6 @@
 ---
 title: "Standard Query Operators Overview (C#)"
+description: The LINQ standard query operators provide query capabilities including filtering, projection, aggregation, and sorting in C#.
 ms.date: 07/20/2015
 ms.assetid: 812fa119-5f65-4139-b4fa-55dccd8dc3ac
 ---

docs/csharp/programming-guide/concepts/linq/statically-compiled-queries-linq-to-xml.md

@@ -1,5 +1,6 @@
 ---
 title: "Statically Compiled Queries (LINQ to XML) (C#)"
+description: Learn about statically compiled queries in LINQ to XML in C# and how they differ from XPath queries, which must be interpreted at runtime.
 ms.date: 07/20/2015
 ms.assetid: 3bf558fe-0705-479d-86d4-00188f5fcf9c
 ---

docs/csharp/programming-guide/concepts/linq/style-part-of-a-wordprocessingml-document.md

@@ -1,5 +1,6 @@
 ---
 title: "Style Part of a WordprocessingML Document"
+description: Learn about the style part of an Office Open XML WordprocessingML document. Use the default style identifier to identify paragraphs that have the default style.
 ms.date: 07/20/2015
 ms.assetid: 5458bccf-3898-4661-904b-7d280c9239a9
 ---

docs/csharp/programming-guide/concepts/linq/type-relationships-in-linq-query-operations.md

@@ -1,5 +1,6 @@
 ---
 title: "Type Relationships in LINQ Query Operations (C#)"
+description: Learn how types of variables in a LINQ query relate to each other. LINQ query operations are strongly typed in the data source, in the query, and in execution.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "inferring type information [LINQ in C#]"

docs/csharp/programming-guide/concepts/linq/using-xslt-to-transform-an-xml-tree.md

@@ -1,5 +1,6 @@
 ---
 title: "Using XSLT to Transform an XML Tree (C#)"
+description: Learn how to use XSLT to transform an XML tree in C# by invoking the XSLT transform on instances of XmlReader and XmlWriter.
 ms.date: 07/20/2015
 ms.assetid: 373a2699-d4c5-471b-9bda-c1f0ab73b477
 ---

docs/csharp/programming-guide/concepts/linq/valid-content-of-xelement-and-xdocument-objects3.md

@@ -1,5 +1,6 @@
 ---
 title: "Valid Content of XElement and XDocument Objects3"
+description: Learn about the valid arguments that can be passed to constructors and methods that you use to add content to elements and documents.
 ms.date: 07/20/2015
 ms.assetid: 0d253586-2b97-459f-b1a7-f30f38f3ed9f
 ---

docs/csharp/programming-guide/concepts/linq/visual-studio-ide-and-tools-support-for-linq.md

@@ -1,5 +1,6 @@
 ---
 title: "Visual Studio IDE and Tools Support for LINQ (C#)"
+description: Learn about Visual Studio features that support LINQ development, such as Object Relational Designer, SQLMetal tool, LINQ-Aware code editor, and Debugger.
 ms.date: 07/20/2015
 ms.assetid: c1f6cfdf-c96f-417f-acc8-4a049772ead3
 ---

docs/csharp/programming-guide/concepts/linq/walkthrough-writing-queries-linq.md

@@ -1,5 +1,6 @@
 ---
 title: "Walkthrough: Writing Queries in C# (LINQ)"
+description: This walkthrough shows how C# language features are used in LINQ query expressions. This article uses Visual Studio as a development environment.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "LINQ [C#], walkthroughs"

docs/csharp/programming-guide/concepts/linq/wordprocessingml-document-with-styles.md

@@ -1,5 +1,6 @@
 ---
-title: "WordprocessingML Document with Styles3"
+title: "WordprocessingML Document with Styles"
+description: This example WordprocessingML document has paragraphs that are formatted with styles. Learn about the document parts that pertain to styles.
 ms.date: 07/20/2015
 ms.assetid: 40e35de6-ac93-4bba-88ab-a018cbe93873
 ---

docs/csharp/programming-guide/concepts/linq/xattribute-class-overview.md

@@ -1,5 +1,6 @@
 ---
 title: "XAttribute Class Overview (C#)"
+description: Attributes are name/value pairs associated with an element. XAttribute represents XML attributes. Learn about working with attributes in LINQ to XML in C#.
 ms.date: 07/20/2015
 ms.assetid: 5a630f24-f9ad-400e-831e-c14ebfc9e142
 ---

docs/csharp/programming-guide/concepts/linq/xdocument-class-overview.md

@@ -1,5 +1,6 @@
 ---
 title: "XDocument Class Overview (C#)"
+description: The XDocument class in C# contains the information necessary for a valid XML document, including an XML declaration, processing instructions, and comments.
 ms.date: 07/20/2015
 ms.assetid: 63305603-ab54-49fc-84e4-f76eecc59549
 ---

docs/csharp/programming-guide/concepts/linq/xelement-class-overview.md

@@ -1,5 +1,6 @@
 ---
 title: "XElement Class Overview (C#)"
+description: The XElement class represents an XML element in C#. It is one of the fundamental classes in LINQ to XML. Learn about the functionality provided by XElement.
 ms.date: 07/20/2015
 ms.assetid: 2b9f0cd8-a1d1-4037-accf-0f38a410fa11
 ---

docs/csharp/programming-guide/concepts/object-oriented-programming.md

@@ -1,5 +1,6 @@
 ---
 title: "Object-Oriented Programming (C#)"
+description: C# provides full support for object-oriented programming including abstraction, encapsulation, inheritance, and polymorphism.
 ms.date: 05/13/2020
 ms.assetid: 89574786-65ef-4335-88bc-fbacd094f183
 ---

docs/csharp/programming-guide/concepts/reflection.md

@@ -1,5 +1,6 @@
 ---
 title: "Reflection (C#)"
+description: Reflection provides objects that describe assemblies, modules, and types in C#. If your code includes attributes, reflection enables you to access them.
 ms.date: 07/20/2015
 ms.assetid: f80a2362-953b-4e8e-9759-cd5f334190d4
 ---

docs/csharp/programming-guide/concepts/serialization/how-to-read-object-data-from-an-xml-file.md

@@ -1,5 +1,6 @@
 ---
 title: "How to read object data from an XML file (C#)"
+description: This C# example reads object data that was previously written to an XML file using the XmlSerializer class.
 ms.date: 07/20/2015
 ms.assetid: 6ad60d96-a4d9-48e6-a8b0-d7f6f803cafa
 ---

docs/csharp/programming-guide/concepts/serialization/how-to-write-object-data-to-an-xml-file.md

@@ -1,5 +1,6 @@
 ---
 title: "How to write object data to an XML file (C#)"
+description: This C# example writes the object from a class to an XML file using the XmlSerializer class. Learn how to compile the code.
 ms.date: 07/20/2015
 ms.assetid: 7681eb98-703d-4005-a369-26a7bca0f894
 ---

docs/csharp/programming-guide/concepts/serialization/index.md

@@ -1,5 +1,6 @@
 ---
 title: "Serialization (C#)"
+description: Serialization converts an object into a stream of bytes to store the object or transmit it to memory, a database, or a file. 
 ms.date: 01/02/2020
 ---
 # Serialization (C#)

docs/csharp/programming-guide/concepts/serialization/walkthrough-persisting-an-object-in-visual-studio.md

@@ -1,5 +1,6 @@
 ---
 title: "Walkthrough: Persisting an Object using C#"
+description: This example creates a basic Loan object in C# and persist its data to a file, then creates a new object with data from the file.
 ms.date: 04/26/2018
 ---
 # Walkthrough: persisting an object using C\#

docs/csharp/programming-guide/delegates/index.md

@@ -1,5 +1,6 @@
 ---
 title: "Delegates - C# Programming Guide"
+description: A delegate in C# is a type that refers to methods with a parameter list and return type. Delegates are used to pass methods as arguments to other methods.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "C# language, delegates"