Updating Database From A Smart Device Application

i m developping a smart device application with vb.net

i m using the following code from:

http://msdn2.microsoft.com/en-us/library/aa454892.aspx

(i still working on the first exercice and i'm following it step by step)

everything is working properly

i was advised to add this code when closing the form1

Try

Me.ContactsBindingSource1.EndEdit()

Me.ContactsTableAdapter1.Update(Me.TestDataSet1.contacts)

MsgBox("Update successful")

Catch ex As Exception

MsgBox("Update failed")

End Try



the problem is:

should this code update the database created with sql server 2005

if yes why isnt it working here

and should the database be replicated on my emulator before it is updated

(in this exercice i do not have a database storerd in the emulator)

plz i urgently need the answer