Update xor2.cs (#4574)

Cleaner version of Equals. Avoids hiding the execution break in an if(){} and also avoids the unnecessary ! on (obj is Point).

Author: JaredKreft

samples/snippets/csharp/VS_Snippets_CLR_System/system.object.gethashcode/cs/xor2.cs

@@ -14,10 +14,15 @@ public Point(int x, int y)
 
     public override bool Equals(Object obj)
     {
-       if (!(obj is Point)) return false;
-
-       Point p = (Point) obj;
-       return x == p.x & y == p.y;
+        if (obj is Point)
+        {
+            Point p = (Point) obj;
+            return x == p.x & y == p.y;
+        }
+        else
+        {
+            return false;
+        }      
     }
 
     public override int GetHashCode()