Nested GridView with DropdownList

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C#

ASP.NET

SharePoint

Hello All,

I want to create a Insertform. in which I require to have nested grid.

The Parent grid will have A dropdown and a AddNew button.Whenever i click a new row should get added.

Child GridView Again has one dropdownlist and a AddNew button. Whenever i click to that a new row(in child grid) should be generated.

The Problem is whenever i click on parent add new button related child disappear. How to hold the data for the same.

Please help me.

Thanks in Advance.