All the things depends on your application type,
You can take some examples from asp.net (
http://www.asp.net/[
^]) website and review what type of code architecture in the example, create your structure of code and class design write proper and understandable variable naming conventions , and try to write smiler type of code for all modules or pages, try to aim code usability and application performance.
if you design good database structure then you can achieve a good application habit.
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