Added shift operator examples with numeric promotion

snippets/csharp/language-reference/operators/BitwiseAndShiftOperators.cs

@@ -19,6 +19,7 @@ public static void Examples()
 
             Console.WriteLine("==== Additional examples");
             CompoundAssignment();
+            CompoundAssignmentWithCast();
             Precedence();
         }
 
@@ -81,6 +82,17 @@ private static void LeftShift()
             // Before: 11001001000000000000000000010001
             // After:  10010000000000000000000100010000
             // </SnippetLeftShift>
+
+            // <SnippetLeftShiftPromoted>
+            byte a = 0b_1111_0001;
+
+            var b = a << 8;
+            Console.WriteLine(b.GetType());
+            Console.WriteLine($"Shifted byte: {Convert.ToString(b, toBase: 2)}");
+            // Output:
+            // System.Int32
+            // Shifted byte: 1111000100000000
+            // </SnippetLeftShiftPromoted>
         }
 
         private static void RightShift()
@@ -156,6 +168,19 @@ private static void CompoundAssignment()
             // </SnippetCompoundAssignment>
         }
 
+        private static void CompoundAssignmentWithCast()
+        {
+            // <SnippetCompoundAssignmentWithCast>
+            byte x = 0b_1111_0001;
+
+            int b = x << 8;
+            Console.WriteLine($"{Convert.ToString(b, toBase: 2)}");  // output: 1111000100000000
+
+            x <<= 8;
+            Console.WriteLine(x);  // output: 0
+            // </SnippetCompoundAssignmentWithCast>
+        }
+
         private static void Precedence()
         {
             // <SnippetPrecedence>