I am new to Software Development, could you please give me some input into which platform is mostly used by other Software Developers.
I am looking to develop software which has DB Connectivity with an attractive customisable UI.
Please recommend the what is currently used in the IT industry by other Successful Software Developers.
There is no simply best development platform. If so every developer should be developing with that instead of using many different tools and platforms. Every platform has its pros and cons. Personally I would recommend you c#. Its easy to start with. Its development environment(visual studio) is very good for interface design(especially for windows forms development) and its very good to start learning object oriented approach, which is very important in software development. If you can clarify you needs more maybe I can recommend something else.
There are many web development tools if you want to develop a web application. Dreamviewer is more simpler than visual studio to start designing web applications.