Problem with creating .MDF file from Visual Studio 2010

Question

I am trying to create a small wpf application by using mdf.

The problem is that when I am trying to add new service-based database (.mdf) I am getting the error \"C

Answer 1

Check to make sure the SQLExpress service is running.

From a command prompt:

sc query mssql$sqlexpress

If the state returned is "1 STOPPED", then start the service with

sc start mssql$sqlexpress