cannot open database, on code execution - shows exception

An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code

Additional information: Cannot open database "aspnet-mywebsite-20150813211505" requested by the login. The login failed.

Trying to connect on local .mdf database in visual studio 2013 - web forms. Created database and c# code for connecting to database. Error shows when i try to execute :

using (SqlConnection con = new SqlConnection(@"Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-mywebsite-20150813211505;Integrated Security=SSPI;"))
                {
                    SqlCommand cmd = new SqlCommand("select * from Users;");
                    cmd.Connection = con;
                    con.Open();
                    DataSet ds = new DataSet();
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(ds);
                    con.Close();
                }

via Chebli Mohamed