An Attempt to attach an auto-named database Error

Question

\"An attempt to attach an auto-named database for file C:\\Users\\John\\documents\\visual studio 2010\\Projects\\PAS\\PAS\\bin\\Debug//PatAddSys.mdf failed. A database with

Answer 1

Actually I've crashed to this problem but I handled it easily. if your connection string is

 connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;"

you need to make your own localDB. first go to command prompt than write

sqllocaldb create MyDatabase

than start your database

sqllocaldb start MyDatabase

than return to VS and change your connection string to

connectionString="Data Source=(LocalDB)\MyDatabase;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;"