Initial data commit

Task/Array-concatenation/C-sharp/array-concatenation-1.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace RosettaCode
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            int[] a = { 1, 2, 3 };
+            int[] b = { 4, 5, 6 };
+
+            int[] c = new int[a.Length + b.Length];
+            a.CopyTo(c, 0);
+            b.CopyTo(c, a.Length);
+
+            foreach(int n in c)
+            {
+                Console.WriteLine(n.ToString());
+            }
+        }
+    }
+}

Task/Array-concatenation/C-sharp/array-concatenation-2.cs

@@ -0,0 +1,12 @@
+using System.Linq;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        int[] a = { 1, 2, 3 };
+        int[] b = { 4, 5, 6 };
+
+        int[] c = a.Concat(b).ToArray();
+    }
+}