diff --git a/csharp/language-reference/operators/Program.cs b/csharp/language-reference/operators/Program.cs
new file mode 100644
index 00000000000..6272c68cd48
--- /dev/null
+++ b/csharp/language-reference/operators/Program.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace operators
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("============== - operator examples =============");
+            SubtractionOperator.Examples();
+            Console.WriteLine();
+        }
+    }
+}
diff --git a/csharp/language-reference/operators/SubtractionOperator.cs b/csharp/language-reference/operators/SubtractionOperator.cs
new file mode 100644
index 00000000000..3d0892f1a27
--- /dev/null
+++ b/csharp/language-reference/operators/SubtractionOperator.cs
@@ -0,0 +1,58 @@
+using System;
+
+namespace operators
+{
+    public static class SubtractionOperator
+    {
+        public static void Examples()
+        {
+            DelegateRemoval();
+            SubtractAndAssign();
+        }
+
+        private static void DelegateRemoval()
+        {
+            // <SnippetDelegateRemoval>
+            Action a = () => Console.Write("a");
+            Action b = () => Console.Write("b");
+
+            var abbaab = a + b + b + a + a + b;
+            abbaab();  // output: abbaab
+            Console.WriteLine();
+
+            var ab = a + b;
+            var abba = abbaab - ab;
+            abba();  // output: abba
+            Console.WriteLine();
+
+            var aba = a + b + a;
+            var first = abbaab - aba;
+            first();  // output: abbaab
+            Console.WriteLine();
+
+            var nihil = abbaab - abbaab;
+            Console.WriteLine(nihil is null);  // output: True
+            // </SnippetDelegateRemoval>
+        }
+
+        private static void SubtractAndAssign()
+        {
+            // <SnippetSubtractAndAssign>
+            int i = 5;
+            i -= 9;
+            Console.WriteLine(i);
+            // Output: -4
+
+            Action a = () => Console.Write("a");
+            Action b = () => Console.Write("b");
+            var printer = a + b + a;
+            printer();  // output: aba
+
+            Console.WriteLine();
+            printer -= a;
+            printer();  // output: ab
+            // </SnippetSubtractAndAssign>
+            Console.WriteLine();
+        }
+    }
+}
\ No newline at end of file
diff --git a/csharp/language-reference/operators/operators.csproj b/csharp/language-reference/operators/operators.csproj
new file mode 100644
index 00000000000..05f268b5cc3
--- /dev/null
+++ b/csharp/language-reference/operators/operators.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <LangVersion>7.3</LangVersion>
+    <StartupObject>operators.Program</StartupObject>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+</Project>
diff --git a/snippets/cpp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CPP/XmlReader_Validate_SchemaSet.cpp b/snippets/cpp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CPP/XmlReader_Validate_SchemaSet.cpp
index 3fba401b522..f202c678601 100644
--- a/snippets/cpp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CPP/XmlReader_Validate_SchemaSet.cpp
+++ b/snippets/cpp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CPP/XmlReader_Validate_SchemaSet.cpp
@@ -10,7 +10,8 @@ using namespace System::IO;
 // Display any validation errors.
 static void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ e )
 {
-   Console::WriteLine( L"Validation Error: {0}", e->Message );
+   Console::WriteLine( L"Validation Error:\n   {0}", e->Message );
+   Console::WriteLine();
 }
 
 int main()
@@ -25,7 +26,7 @@ int main()
    XmlReaderSettings^ settings = gcnew XmlReaderSettings;
    settings->ValidationType = ValidationType::Schema;
    settings->Schemas = sc;
-   settings->ValidationEventHandler += gcnew ValidationEventHandler( ValidationCallBack );
+   settings->ValidationEventHandler += gcnew ValidationEventHandler(ValidationCallBack);
 
    // Create the XmlReader object.
    XmlReader^ reader = XmlReader::Create( L"booksSchemaFail.xml", settings );
@@ -36,4 +37,14 @@ int main()
 
    return 1;
 }
+// The example displays output like the following:
+//   Validation Error: 
+//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
+//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
+//        namespace 'urn:bookstore-schema'.
+//
+//    Validation Error: 
+//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
+//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
+//       namespace 'urn:bookstore-schema'.
 //</snippet1>
diff --git a/snippets/csharp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CS/validschemaset.cs b/snippets/csharp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CS/validschemaset.cs
index 61d211b386a..a08dcbe53fa 100644
--- a/snippets/csharp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CS/validschemaset.cs
+++ b/snippets/csharp/VS_Snippets_Data/XmlReader_Validate_SchemaSet/CS/validschemaset.cs
@@ -1,11 +1,11 @@
-//<snippet1>
+// <Snippet1>
 using System;
 using System.Xml;
 using System.Xml.Schema;
 using System.IO;
 
-public class Sample {
-
+public class Sample 
+{
   public static void Main() {
 
     // Create the XmlSchemaSet class.
@@ -18,19 +18,28 @@ public static void Main() {
     XmlReaderSettings settings = new XmlReaderSettings();
     settings.ValidationType = ValidationType.Schema;
     settings.Schemas = sc;
-    settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
+    settings.ValidationEventHandler += ValidationCallBack;
  
     // Create the XmlReader object.
     XmlReader reader = XmlReader.Create("booksSchemaFail.xml", settings);
 
     // Parse the file. 
     while (reader.Read());
-    
   }
 
   // Display any validation errors.
   private static void ValidationCallBack(object sender, ValidationEventArgs e) {
-    Console.WriteLine("Validation Error: {0}", e.Message);
+    Console.WriteLine($"Validation Error:\n   {e.Message}\n");
   }
 }
-//</snippet1>
\ No newline at end of file
+// The example displays output like the following:
+//   Validation Error: 
+//        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
+//        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
+//        namespace 'urn:bookstore-schema'.
+//
+//    Validation Error: 
+//       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
+//       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
+//       namespace 'urn:bookstore-schema'.
+// </Snippet1>
\ No newline at end of file
diff --git a/snippets/visualbasic/VS_Snippets_Data/XmlReader_Validate_SchemaSet/VB/validschemaset.vb b/snippets/visualbasic/VS_Snippets_Data/XmlReader_Validate_SchemaSet/VB/validschemaset.vb
index 52b3bc8353e..58f308d0094 100644
--- a/snippets/visualbasic/VS_Snippets_Data/XmlReader_Validate_SchemaSet/VB/validschemaset.vb
+++ b/snippets/visualbasic/VS_Snippets_Data/XmlReader_Validate_SchemaSet/VB/validschemaset.vb
@@ -1,12 +1,10 @@
-'<snippet1>
-Imports System
+' <Snippet1>
 Imports System.Xml
 Imports System.Xml.Schema
 Imports System.IO
 
-public class Sample 
-
-  public shared sub Main() 
+Public Module Sample 
+  Public Sub Main() 
 
     ' Create the XmlSchemaSet class.
     Dim sc as XmlSchemaSet = new XmlSchemaSet()
@@ -24,14 +22,25 @@ public class Sample
     Dim reader as XmlReader = XmlReader.Create("booksSchemaFail.xml", settings)
 
     ' Parse the file. 
-    while reader.Read()
-    end while
+    While reader.Read()
+    End While
     
-  end sub
+  End Sub
 
   ' Display any validation errors.
-  private shared sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
-    Console.WriteLine("Validation Error: {0}", e.Message)
-  end sub
-end class
-'</snippet1>
\ No newline at end of file
+  Private Sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
+    Console.WriteLine($"Validation Error:{vbCrLf}   {e.Message}")
+    Console.WriteLine()
+  End Sub
+End Module
+' The example displays output like the following:
+'   Validation Error: 
+'        The element 'book' in namespace 'urn:bookstore-schema' has invalid child element 'author' 
+'        in namespace 'urn:bookstore-schema'. List of possible elements expected: 'title' in 
+'        namespace 'urn:bookstore-schema'.
+'
+'    Validation Error: 
+'       The element 'author' in namespace 'urn:bookstore-schema' has invalid child element 'name' 
+'       in namespace 'urn:bookstore-schema'. List of possible elements expected: 'first-name' in 
+'       namespace 'urn:bookstore-schema'.
+' </Snippet1>
\ No newline at end of file