Initial data commit

Task/String-case/C-sharp/string-case-1.cs

@@ -0,0 +1,23 @@
+class Program
+{
+    static void Main(string[] args)
+    {
+        string input;
+        Console.Write("Enter a series of letters: ");
+        input = Console.ReadLine();
+        stringCase(input);
+    }
+
+    private static void stringCase(string str)
+    {
+        char[] chars = str.ToCharArray();
+        string newStr = "";
+
+        foreach (char i in chars)
+            if (char.IsLower(i))
+                newStr += char.ToUpper(i);
+            else
+                newStr += char.ToLower(i);
+        Console.WriteLine("Converted: {0}", newStr);
+    }
+}