should i make my aim of getting phd in computer science

Question

should i make my aim of getting phd in computer science , or should i continue to work in asp.net, i am working in asp.net from four five years or more than that, if i go for phd from top schools first i need ms in computer science, to do ms i need money and time , and i do full time job, i think phd is good as compare to programming in asp.net c