InfoPath Dev

Hi All,
I am working on a request form to collect data from end-users. I am wondering to know how I can write C# codes to insert the data from the textfileds into the backend tables? Do I need to add a submit button to perform this action? Can anyone introduce me a good website with example C# code in developing Infopth project. Thanks in advance!

Have you taken a look at this MSDN lab for InfoPath? It might help you get started on this:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_ip2003_tr/html/odc_INF_Lab_08.asp

hope that helps