Hi
You need to chabge this line in the wb config to point to your sever
<add key="ConnectionString" value="server=YourServer;uid=YourUserName;pwd=Yourpassword;database=Commerce" />
or if u are useing locale host server it will be something like below using your server name
<add key="ConnectionString" value="server=Desktop;Trusted_Connection=true;database=Commerce" />