visual studio 2013 - Restore database in SQL LocalDB using VB.NET -

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i have project developed in vb.net , sql server 2012 localdb (v11) , need backup/restore facility in application. backup part complete stuck @ restore part. query want worked (and working fine in sql editor)

alter database [<.mdf file path>]  set single_user rollback immediate  restore database [<.mdf file path] disk='<.bak file path'

and here code in vb.net trying execute

sub restorequery(byval que string)     mainform.conn.close()     con = new sqlconnection("data source=(localdb)\v11.0;database=master;integrated security=true;")     if not con.state = connectionstate.open con.open()     cmd = new sqlcommand(que, con)     cmd.executenonquery() end sub

and here approaches tried far

  1. using same query above

    restorequery("alter database [<.mdf file path>] set single_user rollback immediate") restorequery("restore database [<.mdf file path>] disk='<.bak file path>'")

    and results in error

    exclusive access not obtained because database in use. restore database terminating abnormally.

  2. after finding reason above issue (which nonsense after using master database while opening connection , closing opened connections using mainform.conn.close() ), tried second approach per links , references stackoverflow. , here queries tried:

    restorequery("use [master] ") restorequery("alter database [<.mdf file name>] set single_user rollback immediate") restorequery("restore database[<.mdf file name>] disk='<.bak file name>'") restorequery("alter database [<.mdf file name>] set multi_user") restorequery("use [<.mdf file name>]")

    and here error got while executing second query :

    additional information: user not have permission alter database <.mdf file name path>, database not exist, or database not in state allows access checks. alter database statement failed.

is there other way restore sql server localdb using vb.net ?

i have used code in 1 of project. 

try       openfiledialog1             .filter = ("db backup file|*.bak;")             .filterindex = 4      end       openfiledialog1.filename = ""       if openfiledialog1.showdialog() = dialogresult.ok           cursor = cursors.waitcursor           sqlconnection.clearallpools()           con = new sqlconnection(cs)           con.open()           dim cb string = "use master alter database [" & system.windows.forms.application.startuppath & "\brh.mdf] set single_user rollback immediate restore database [" & system.windows.forms.application.startuppath & "\brh.mdf] disk='" & openfiledialog1.filename & "' replace alter database [" & system.windows.forms.application.startuppath & "\brh.mdf] set multi_user "           cmd = new sqlcommand(cb)           cmd.connection = con           cmd.executereader()           con.close()     end if catch ex exception     messagebox.show(ex.message, "error", messageboxbuttons.ok, messageboxicon.error)     end try

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