NikkiBuck · November 19, 2012 05:57 · Nov 19, 2012
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,13 @@
+    public int CompareTo(object obj)
+        {
+            if (obj is Book)
+            {
+                Book otherBook = (Book)obj;
+                if (this.Title != otherBook.Title)
+                {
+                    return this.Title.CompareTo(otherBook.Title);
+                }
+            }
+            else
+                throw new ArgumentException("One or both objects are not books.");
+        }