dotnet · BillWagner · Jul 17, 2020 · Jul 16, 2020 · Jul 16, 2020 · Jul 17, 2020
diff --git a/docs/csharp/how-to/modify-string-contents.md b/docs/csharp/how-to/modify-string-contents.md
@@ -1,5 +1,6 @@
 ---
 title: "How to modify string contents - C# Guide"
+description: Review examples of several techniques to modify existing string contents in C#, which return a new string object.
 ms.date: 02/26/2018
 helpviewer_keywords: 
   - "strings [C#], modifying"

diff --git a/docs/csharp/how-to/search-strings.md b/docs/csharp/how-to/search-strings.md
@@ -1,5 +1,6 @@
 ---
 title: "How to search strings (C# Guide)"
+description: Learn about two strategies to search for text in strings in C#. String class methods search for specific text. Regular expressions search for patterns in text.
 ms.date: 02/21/2018
 helpviewer_keywords: 
   - "searching strings [C#]"

diff --git a/docs/csharp/programming-guide/arrays/arrays-as-objects.md b/docs/csharp/programming-guide/arrays/arrays-as-objects.md
@@ -1,5 +1,6 @@
 ---
 title: "Arrays as Objects - C# Programming Guide"
+description: Arrays in C# are Objects of the abstract base type Array. You can use the properties and other class members of Array, such as the Length property. 
 ms.date: 07/20/2015
 helpviewer_keywords:
   - "arrays [C#], as objects"

diff --git a/docs/csharp/programming-guide/arrays/implicitly-typed-arrays.md b/docs/csharp/programming-guide/arrays/implicitly-typed-arrays.md
@@ -1,5 +1,6 @@
 ---
 title: "Implicitly Typed Arrays - C# Programming Guide"
+description: The type of an implicitly-typed array in C# is inferred from the elements in the array initializer. Use implicitly-typed arrays in query expressions.
 ms.date: 07/20/2015
 helpviewer_keywords:
   - "arrays [C#], implicitly-typed"

diff --git a/docs/csharp/programming-guide/arrays/index.md b/docs/csharp/programming-guide/arrays/index.md
@@ -1,5 +1,6 @@
 ---
 title: "Arrays - C# Programming Guide"
+description: Store multiple variables of the same type in an array data structure in C#. Declare an array by specifying a type or specify Object to store any type.
 ms.date: 07/20/2015
 helpviewer_keywords:
   - "arrays [C#]"

diff --git a/docs/csharp/programming-guide/arrays/jagged-arrays.md b/docs/csharp/programming-guide/arrays/jagged-arrays.md
@@ -1,5 +1,6 @@
 ---
 title: "Jagged Arrays - C# Programming Guide"
+description: A jagged array in C# is an array whose elements are arrays of different dimensions and sizes. Learn how to declare, initialize, and access jagged arrays.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "jagged arrays [C#]"

diff --git a/docs/csharp/programming-guide/arrays/multidimensional-arrays.md b/docs/csharp/programming-guide/arrays/multidimensional-arrays.md
@@ -1,5 +1,6 @@
 ---
 title: "Multidimensional Arrays - C# Programming Guide"
+description: Arrays in C# can have more than one dimension. This example declaration creates a two-dimensional array of four rows and two columns.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "arrays [C#], multidimensional"

diff --git a/docs/csharp/programming-guide/arrays/passing-arrays-as-arguments.md b/docs/csharp/programming-guide/arrays/passing-arrays-as-arguments.md
@@ -1,5 +1,6 @@
 ---
 title: "Passing arrays as arguments - C# Programming Guide"
+description: Arrays in C# can be passed as arguments to method parameters. Because arrays are reference types, the method can change the value of the elements.
 ms.date: 07/05/2018
 helpviewer_keywords: 
   - "arrays [C#], passing as arguments"

diff --git a/docs/csharp/programming-guide/arrays/single-dimensional-arrays.md b/docs/csharp/programming-guide/arrays/single-dimensional-arrays.md
@@ -1,5 +1,6 @@
 ---
 title: "Single-Dimensional Arrays - C# Programming Guide"
+description: Create a single-dimensional array in C# using the new operator specifying the array element type and the number of elements. 
 ms.date: 06/03/2020
 helpviewer_keywords: 
   - "single-dimensional arrays [C#]"

diff --git a/docs/csharp/programming-guide/arrays/using-foreach-with-arrays.md b/docs/csharp/programming-guide/arrays/using-foreach-with-arrays.md
@@ -1,5 +1,6 @@
 ---
 title: "Using foreach with arrays - C# Programming Guide"
+description: The foreach statement in C# iterates through the elements of an array. For single-dimensional arrays, foreach processes elements in increasing index order.
 ms.date: 05/23/2018
 helpviewer_keywords: 
   - "arrays [C#], foreach"

diff --git a/...ming-guide/classes-and-structs/abstract-and-sealed-classes-and-class-members.md b/...ming-guide/classes-and-structs/abstract-and-sealed-classes-and-class-members.md
@@ -1,5 +1,6 @@
 ---
 title: "Abstract and Sealed Classes and Class Members - C# Programming Guide"
+description: The abstract keyword in C# creates incomplete classes and class members. The sealed keyword prevents inheritance of previously virtual classes or class members.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "abstract classes [C#]"

diff --git a/docs/csharp/programming-guide/classes-and-structs/access-modifiers.md b/docs/csharp/programming-guide/classes-and-structs/access-modifiers.md
@@ -1,5 +1,6 @@
 ---
 title: "Access Modifiers - C# Programming Guide"
+description: All types and type members in C# have an accessibility level which controls whether they can be used from other code. Review this list of access modifiers.
 ms.date: 03/08/2020
 helpviewer_keywords: 
   - "C# Language, access modifiers"

diff --git a/docs/csharp/programming-guide/classes-and-structs/anonymous-types.md b/docs/csharp/programming-guide/classes-and-structs/anonymous-types.md
@@ -1,5 +1,6 @@
 ---
 title: "Anonymous Types - C# Programming Guide"
+description: Anonymous types in C# encapsulate a set of read-only properties in an object without having to explicitly define a type. The compiler generates a name.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "anonymous types [C#]"

diff --git a/docs/csharp/programming-guide/classes-and-structs/auto-implemented-properties.md b/docs/csharp/programming-guide/classes-and-structs/auto-implemented-properties.md
@@ -1,5 +1,6 @@
 ---
 title: "Auto-Implemented Properties - C# Programming Guide"
+description: For an auto-implemented property in C#, the complier creates a private, anonymous backing field accessed only through get and set accessors of the property.
 ms.date: 01/31/2020
 helpviewer_keywords: 
   - "auto-implemented properties [C#]"

diff --git a/docs/csharp/programming-guide/classes-and-structs/constants.md b/docs/csharp/programming-guide/classes-and-structs/constants.md
@@ -1,5 +1,6 @@
 ---
 title: "Constants - C# Programming Guide"
+description: Constants in C# are compile-time literal values, which do not change once the program is compiled. Only C# built-in types can be constants.
 ms.date: 07/20/2015
 helpviewer_keywords: 
   - "C# language, constants"

diff --git a/docs/csharp/programming-guide/classes-and-structs/constructors.md b/docs/csharp/programming-guide/classes-and-structs/constructors.md
@@ -1,5 +1,6 @@
 ---
 title: "Constructors - C# Programming Guide"
+description: A constructor in C# is called when a class or struct is created. Use constructors to set defaults, limit instantiation, and write flexible, easy-to-read code.
 ms.date: 05/05/2017
 helpviewer_keywords: 
   - "constructors [C#]"

diff --git a/docs/csharp/programming-guide/classes-and-structs/destructors.md b/docs/csharp/programming-guide/classes-and-structs/destructors.md
@@ -1,5 +1,6 @@
 ---
 title: "Finalizers - C# Programming Guide"
+description: Finalizers in C#, which are also called destructors, perform any necessary final clean-up when a class instance is being collected by the garbage collector.
 ms.date: 10/08/2018
 helpviewer_keywords: 
   - "~ [C#], in finalizers"

diff --git a/docs/csharp/programming-guide/classes-and-structs/extension-methods.md b/docs/csharp/programming-guide/classes-and-structs/extension-methods.md
@@ -1,5 +1,6 @@
 ---
 title: "Extension Methods - C# Programming Guide"
+description: Extension methods in C# enable you to add methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type.
 ms.date: 03/19/2020
 helpviewer_keywords: 
   - "methods [C#], adding to existing types"

diff --git a/docs/csharp/programming-guide/classes-and-structs/fields.md b/docs/csharp/programming-guide/classes-and-structs/fields.md
@@ -1,5 +1,6 @@
 ---
 title: Fields - C# Programming Guide
+description: A field in C# is a variable of any type that is declared directly in a class or struct. Fields are members of their containing type.
 ms.date: 07/20/2015
 helpviewer_keywords:
   - "fields [C#]"

diff --git a/docs/csharp/programming-guide/index.md b/docs/csharp/programming-guide/index.md
@@ -1,5 +1,6 @@
 ---
 title: "C# Programming Guide"
+description: Use these resources for detailed information on key C# language features and features accessible to C# through .NET.
 ms.date: 05/02/2017
 f1_keywords: 
   - "cs.langref"