How to generate id dynamically in ASP.NET page

Question

Hi,
  I wanted to generate the unique id in the label control after clicking submit button using asp.net. here i am providing a form to fill after opening the url and after filling entire form the user should click on submit button at this time i wanted to generate one id like cdu001 and all the values should store in database. Again one more user will open the form he will enter all the details and click on submit button here one more different id should generate like cdu002. like wise process will continue. please anyone give me some ideas how to do it using asp.net code, thanks in advance.