Added checked/unchecked snippet

Author: ahotko

CSharp Code Samples/CodeSamples/CodeSamples.csproj

@@ -105,6 +105,7 @@
     <Compile Include="Useful\GarbageCollectionSample.cs" />
     <Compile Include="Useful\LinqSample.cs" />
     <Compile Include="Classes\ClassAndMethodNamesSample.cs" />
+    <Compile Include="Useful\OverflowCheckSample.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />

CSharp Code Samples/CodeSamples/Program.cs

@@ -149,6 +149,11 @@ static void Main(string[] args)
             enumSample.Execute();
             #endregion
 
+            #region Arithmetic Overflow
+            var overflowCheckSample = new OverflowCheckSample();
+            overflowCheckSample.Execute();
+            #endregion
+
             Console.WriteLine();
             Console.WriteLine("End Code Samples");
 

CSharp Code Samples/CodeSamples/Useful/OverflowCheckSample.cs

@@ -0,0 +1,52 @@
+using System;
+
+namespace CodeSamples.Useful
+{
+    public class OverflowCheckSample : SampleExecute
+    {
+        public override void Execute()
+        {
+            Title("OverflowCheckSampleExecute");
+
+            int firstValue;
+            int secondValue;
+
+            int maxValue = 2147483647;
+            const int maxInt = int.MaxValue;
+
+            //do not check for overflow
+            unchecked
+            {
+                firstValue = 2147483647 + 100;
+            }
+            Console.WriteLine($"Unchecked sum 1 (in block) (overflow) = {firstValue}");
+            //...or...
+            firstValue = unchecked(maxInt + 100);
+
+            Console.WriteLine($"Unchecked sum 1 (inline) (overflow) = {firstValue}");
+
+            //unchecked by default at compile time and run time because it contains variables
+            secondValue = maxValue + 100;
+            Console.WriteLine($"Unchecked sum 2 (variabled added) (overflow) = {secondValue}");
+
+            //catch overflow at run time
+            try
+            {
+                checked
+                {
+                    secondValue = maxValue + 100;
+                }
+                Console.WriteLine($"Unchecked sum 2 (in block) (overflow) = {secondValue}");
+                //...or...
+                secondValue = unchecked(maxValue + 100);
+                Console.WriteLine($"Unchecked sum 2 (inline) (overflow) = {secondValue}");
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine($"Exception '{e.GetType().Name}' with message '{e.Message}' was thrown.");
+            }
+
+            Finish();
+        }
+    }
+}