Backup and restore SQL server 2012 database from aspx page

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ASP.NET

SQL

server

I use sql server 2012 database to store data for my application
I want to make a backup and restore for the database from inside my application
I've Implemented sqlcommand to execute backup operation

Using Cmd As New SqlCommand() With {.Connection = New SqlConnection(ConfigurationManager.ConnectionStrings("JoyBoxArchiveCn").ConnectionString)}

            Dim a = New SqlConnection
            Dim Fnm As String = Server.MapPath("~\backup\test001.bak")
           ' Backup Code
            Cmd.CommandText = "backup database jbxarchive to disk='" & Fnm & "'"
           Cmd.Connection.Open()
           r = Cmd.ExecuteNonQuery
           Cmd.Connection.Close()

and that does it ok
the problem is when I've tried to restore

Cmd.CommandText = "alter database jbxarchive set single_user with rollback immediate; "
           Cmd.CommandText &= "restore database jbxarchive from disk='" & Fnm & "' with replace;"
           Cmd.CommandText &= "alter database jbxarchive set multi_user;"

from management studio it works fine but from code behind I've got a security error that the current user does not have permission to restore database

please instruct me the correct way to backup and restore database from code behind

What I have tried:

from management studio it works fine but from code behind I've got a security error that the current user does not have permission to restore database