Initial data commit

Task/Vigen-re-cipher/C-sharp/vigen-re-cipher.cs

@@ -0,0 +1,44 @@
+using System;
+
+namespace VigenereCipher
+{
+    class VCipher
+    {
+        public string encrypt(string txt, string pw, int d)
+        {
+            int pwi = 0, tmp;
+            string ns = "";
+            txt = txt.ToUpper();
+            pw = pw.ToUpper();
+            foreach (char t in txt)
+            {
+                if (t < 65) continue;
+                tmp = t - 65 + d * (pw[pwi] - 65);
+                if (tmp < 0) tmp += 26;
+                ns += Convert.ToChar(65 + ( tmp % 26) );
+                if (++pwi == pw.Length) pwi = 0;
+            }
+
+            return ns;
+        }
+    };
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            VCipher v = new VCipher();
+
+            string s0 = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!",
+                   pw = "VIGENERECIPHER";
+
+            Console.WriteLine(s0 + "\n" + pw + "\n");
+            string s1 = v.encrypt(s0, pw, 1);
+            Console.WriteLine("Encrypted: " + s1);
+            s1 = v.encrypt(s1, "VIGENERECIPHER", -1);
+            Console.WriteLine("Decrypted: " + s1);
+            Console.WriteLine("\nPress any key to continue...");
+            Console.ReadKey();
+        }
+    }
+}