tasks a-s

Task/Queue-Usage/C-sharp/queue-usage.cs

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+using System;
+using System.Collections.Generic;
+
+namespace RosettaCode
+{
+    class Program
+    {
+        static void Main()
+        {
+            // Create a queue and "push" items into it
+            Queue<int> queue  = new Queue<int>();
+            queue.Enqueue(1);
+            queue.Enqueue(3);
+            queue.Enqueue(5);
+
+            // "Pop" items from the queue in FIFO order
+            Console.WriteLine(queue.Dequeue()); // 1
+            Console.WriteLine(queue.Dequeue()); // 3
+            Console.WriteLine(queue.Dequeue()); // 5
+
+            // To tell if the queue is empty, we check the count
+            bool empty = queue.Count == 0;
+            Console.WriteLine(empty); // "True"
+
+            // If we try to pop from an empty queue, an exception
+            // is thrown.
+            try
+            {
+                queue.Dequeue();
+            }
+            catch (InvalidOperationException exception)
+            {
+                Console.WriteLine(exception.Message); // "Queue empty."
+            }
+        }
+    }
+}