Attaching DB after it has been detached

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VB

SQL-Server

Hi,

I am using following code to attach my DB to SQL Server. The problem is if I create a new file and attach it through my code but when I detach the file using SSMS and again run the same code, it gives error.
Error is:

"Unable to open the physical file "e:\dbForATTWithPWD.mdf". Operating system error 2: "2(error not found)""

The code is:

Dim conn As New SqlConnection("Server=MyHomeServer\SQLExpress;Database=master;Integrated Security=SSPI")
Dim cmd As New SqlCommand("", conn)
cmd.CommandText = "CREATE DATABASE MyHomeWithPWD ON ( FILENAME = 'e:\dbForATTWithPWD.mdf' ), ( FILENAME = 'e:\dbForATTWithPWD_log.ldf' ) FOR ATTACH"
conn.Open()
cmd.ExecuteNonQuery()
cmd.Dispose()
conn.Dispose()

Why is it happening. All the permissions are the same even first time.

Also what should be the connection string if I need to use DB with uid sa and pwd abc123 ?

Thanks