difference of coding from adding data source or adding object

[Vani Alcaraz Dinglasan]

i use vb.net for our system in making our thesis.. and our database must be made from sql...

what is the difference of connecting the database to vb.net

--USING - "CODING"

difference from

---USING - "ADDING DATA SOURCE, ahm the one that you would browse the sql .mdf file...