N-Level (MultiLevel) Bootstrap Responsive not showing SubMenu in ASP.Net

in this article you are showing menu bar that bind from data base

menuid parentmenuid title description url

1          0                   abc    abc         abc

2           1                   def    def        def

3           0                    ghi  ghi         ghi

4           3                    jkl   jkl         jkl

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in that case menu abc has submenu that is def

menu ghi has submenu jkl 

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but dont show second menu of submenu 

please help