Fix typo and change postfix decrement operator to prefix increment op… (#7230)

* Fix typo and change postfix decrement operator to prefix increment operator

* Update samples/snippets/csharp/VS_Snippets_CLR_System/system.String.Compare5/cs/Example.cs

Co-authored-by: Genevieve Warren <[email protected]>

* Create Example.csproj

Co-authored-by: Genevieve Warren <[email protected]>

Author: irenema2018

samples/snippets/csharp/VS_Snippets_CLR_System/system.String.Compare5/cs/Example.cs

@@ -9,12 +9,12 @@ public static void Main()
       string name1 = "Jack Smith";
       string name2 = "John Doe";
 
-      // Get position of space character.
+      // Get position of character after the space character.
       int index1 = name1.IndexOf(" ");
-      index1 = index1 < 0 ? 0 : index1--;
+      index1 = index1 < 0 ? 0 : ++index1;
 
       int index2 = name2.IndexOf(" ");
-      index1 = index1 < 0 ? 0 : index1--;
+      index2 = index2 < 0 ? 0 : ++index2;
 
       int length = Math.Max(name1.Length, name2.Length);
 

samples/snippets/csharp/VS_Snippets_CLR_System/system.String.Compare5/cs/Example.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>8.0</LangVersion>
+    <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+</Project>