SQL Server Database Attaching Types

I am attaching DBs using following code.
Dim conn As New SqlConnection("Server=MyHomeServerSQLExpress;Database=master;Integrated Security=SSPI")
Dim cmd As New SqlCommand("", conn)
cmd.CommandText = "CREATE DATABASE dbNoPWD ON ( FILENAME = 'd:dbNoPWD.mdf' ), ( FILENAME = 'd:dbNoPWD_log.ldf' ) FOR ATTACH"
conn.Open()
cmd.ExecuteNonQuery()
cmd.Dispose()
conn.Dispose()

I do not want to give any username and password. When I ran the above code and then checked SSMS, I found my attach DB was not checked in Roles (pls. see pic.) The problem with this is my network computers can not access this DB. I want to run some code like above (without sa password) and want that all my network computers can access the DB without my user get involved in setting up SSMS.