how to code backup nd recovery of database on vb.net

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VB

SQL

how to code backup and recovery of database on 3-tier application design.
please help

[inserted from OP solution]

Function backup_database() As DataTable
            Dim dal As New csSQLDALVB
            Dim list As New List(Of csParameterListType)
            Return dal.executespreturndt("BackupD_mydatabase", list)
      End Function
      Function restore_database() As DataTable
            Dim dal As New Restore_database
            Dim list As New List(Of csParameterListType)
            Return dal._datatable("RESTORE_DATABASE", list)
      End Function
End Class

Yes m using sql server. this is my functions on business layer and on presentation i called it like this

Dim restore As New BACKUP_recovery
            restore.restore_database()

what must i do on the Sql server?