Problems Backing Up SQL Express Database...

Hello,

I found some code below that works fine when I run it in my vb.net code in Design mode. When I publish the application, run the app and then execute the sub MyDbBackup() I get the following error:  Cannot open backup device 'C:dbBackup'. Operating system error 5(Access is denied). BACKUP DATABASE is terminating abnormally.

 

Here is the code that runs:

 Public Sub MyDbBackup()
        Dim sqlconn As New SqlClient.SqlConnection(MyConnectionStringdb)
        sqlconn.Open()
        Dim Backupcommand As SqlClient.SqlCommand = New SqlClient.SqlCommand("BACKUP DATABASE [" & sqlconn.Database.ToString & "] TO DISK = 'c:myDataBaseBackup.bak'")
        Backupcommand.CommandType = CommandType.Text
        Backupcommand.Connection = sqlconn
        Backupcommand.ExecuteNonQuery()
        sqlconn.Close()
    End Sub


2 Questions: Why does it backup fine in design mode, but not after it is published? Also, in design mode, my database is called TAP_Master.mdf but when I look under C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLData, I do not see that database name... all I see is master.mdf, model, msdbdata etc... Is that database stored anywhere else?

I have set the MyConnectionStringdb variable to = "Data Source =.SQLEXPRESS;AttachDbFilename=|DataDirectory|TAP_Master.mdf;Integrated Security=True;User Instance=True"

 

Thanks in advance.