Update snippets to compile in .NET 7

docs/standard/exceptions/how-to-explicitly-throw-exceptions.md

@@ -15,7 +15,7 @@ ms.assetid: 72bdd157-caa9-4478-9ee3-cb4500b84528
 ---
 # How to explicitly throw exceptions
 
-You can explicitly throw an exception using the C# [`throw`](../../csharp/language-reference/keywords/throw.md) or the Visual Basic [`Throw`](../../visual-basic/language-reference/statements/throw-statement.md) statement. You can also throw a caught exception again using the `throw` statement. It is good coding practice to add information to an exception that is re-thrown to provide more information when debugging.
+You can explicitly throw an exception using the C# [`throw`](../../csharp/language-reference/keywords/throw.md) or the Visual Basic [`Throw`](../../visual-basic/language-reference/statements/throw-statement.md) statement. You can also throw a caught exception again using the `throw` statement. It's good coding practice to add information to an exception that's rethrown to provide more information when debugging.
 
 The following code example uses a `try`/`catch` block to catch a possible <xref:System.IO.FileNotFoundException>. Following the `try` block is a `catch` block that catches the <xref:System.IO.FileNotFoundException> and writes a message to the console if the data file is not found. The next statement is the `throw` statement that throws a new <xref:System.IO.FileNotFoundException> and adds text information to the exception.
 

samples/snippets/csharp/VS_Snippets_CLR/Exception.Throwing/CS/Project.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+      <OutputType>Exe</OutputType>
+      <TargetFramework>net7.0</TargetFramework>
+      <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
+

samples/snippets/csharp/VS_Snippets_CLR/Exception.Throwing/CS/throw.cs

@@ -1,32 +1,35 @@
-// <Snippet1>
-using System;
+using System;
 using System.IO;
 
-public class ProcessFile
+namespace Example
 {
-    public static void Main()
+    public class ProcessFile
     {
-        FileStream fs;
-        try
+        public static void Main()
         {
-            // Opens a text tile.
-            fs = new FileStream(@"C:\temp\data.txt", FileMode.Open);
-            var sr = new StreamReader(fs);
+            // <Snippet1>
+            var fs = default(FileStream);
+            try
+            {
+                // Opens a text tile.
+                fs = new FileStream(@"C:\temp\data.txt", FileMode.Open);
+                var sr = new StreamReader(fs);
 
-            // A value is read from the file and output to the console.
-            string line = sr.ReadLine();
-            Console.WriteLine(line);
-        }
-        catch(FileNotFoundException e)
-        {
-            Console.WriteLine($"[Data File Missing] {e}");
-            throw new FileNotFoundException(@"[data.txt not in c:\temp directory]", e);
-        }
-        finally
-        {
-            if (fs != null)
-                fs.Close();
+                // A value is read from the file and output to the console.
+                string? line = sr.ReadLine();
+                Console.WriteLine(line);
+            }
+            catch (FileNotFoundException e)
+            {
+                Console.WriteLine($"[Data File Missing] {e}");
+                throw new FileNotFoundException(@"[data.txt not in c:\temp directory]", e);
+            }
+            finally
+            {
+                if (fs != null)
+                    fs.Close();
+            }
+            // </Snippet1>
         }
     }
 }
-// </Snippet1>

samples/snippets/visualbasic/VS_Snippets_CLR/Exception.Throwing/VB/Project.vbproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+      <OutputType>Library</OutputType>
+      <TargetFrameworks>net7.0</TargetFrameworks>
+    </PropertyGroup>
+
+</Project>
+

samples/snippets/visualbasic/VS_Snippets_CLR/Exception.Throwing/VB/throw.vb

@@ -8,7 +8,7 @@ Imports System.IO
 Public Class ProcessFile
 
     Public Shared Sub Main()
-        Dim fs As FileStream
+        Dim fs As FileStream = Nothing
         Try
             ' Opens a text file.
             fs = New FileStream("c:\temp\data.txt", FileMode.Open)