ExtensionMethods ready

ExtensionMethods/StringExtensions.cs

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+using System;
+using System.Linq;
+
+namespace ExtensionMethods
+{
+    public static class StringExtensions
+    {
+        public static string Shorten(this String str, int numberOfWords)
+        {
+            if (numberOfWords < 0)
+                throw new ArgumentOutOfRangeException("numberOfWords should be greater or equal to 0.");
+            if (numberOfWords == 0)
+                return "";
+
+            var words = str.Split(' ');
+
+            if (words.Length <= numberOfWords)
+                return str;
+
+            return string.Join(" ", words.Take(numberOfWords))+"...";
+        }
+    }
+}