ADO.NET doubt

Question

1) is The coding technique for ADO.NET in mobile web application and ASP.NET web application the same?? 2) Do you know any website or reference book that teaches us how to setup up SQL Server 2000 ( or any version) and then using it to do data access with ADO.NET for mobile web application (like insert, update, delete records in database). I am quite blurred with this now........ 3) although i do not go really deep yet, but i know that in ADO.NET, there is a class called DataSet with which you can populate data from original data source (such as MS Access) and then make changes to it without affecting the original data source. So if i also want to reflect the changes in the original data source, what methods should i refer to???? (actually i roughly know how to populate Dataset with data from original data source but i do not know the coding technique to also send the changes from dataset back to original data source)