Without strain Good design is more than just adding pretty visuals to your application after you’ve implemented all the functionality.What’s more, it’s the process of deciding how users will interact with your app, also how it will look and function. And user experience plays a huge part in determining how happy people will be with your app, hence you shouldn’t skimp on this step. Design should not be an afterthought.
Probably I am showing my age, nevertheless I remember almost every computer science class I took, starting with a lecture about the importance of planning your programs before beginning to code. We used tools such as flow charts drawn on actual paper with a real pencil (and usually a big eraser nearby). This was since computer time was expensive on that old hardware. Therefore you wanted to be sure you made the most of the time you had. Computer time is properly cheap nowadays and there are amazing tools, like Visual Studio and Expression Blend, that make it hugely easy to get something that looks fairly good up and running highly quickly. Accordingly, there’s a tendency to sit down and just start coding.
Hence,if you are able to design your windows phone apps to sell,undoubtedly,after a short while you will succeed.So take action to design it as soon as possibly.