I need some development help on  “Sales Dashboard Telerik WPF”  which was already developed, I have gone through the source code everything Is well but I got some confusion please try to  clarify  it , some questions on it 
 
1. Why a Service is Created instead of coding locally in the same project.
2. Where Database binding code is exists in the project I mean getting the data ,
I have little confused where is the code for getting the data.
So, Please I need some assistance from any one from your development team.
                                1. Why a Service is Created instead of coding locally in the same project.
2. Where Database binding code is exists in the project I mean getting the data ,
I have little confused where is the code for getting the data.
So, Please I need some assistance from any one from your development team.