>>>What is the optimum & most secure way to update data from within an application.
>>>some use direct "Update" command, some do it through SQL stored procedure, ...
>>>
>>>The development tools used are VB.NET 2008 and SQL 2005
>>
>>For security you will want to use Stored Procedures - this way you are not exposing your database structure information,
>
>With the Entity framework as far as I understood everything is secure.

Talk to Julia Lerman and Stephen Forte and then revise your post... EF v2 will be much more secure.