>>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.