Treeview Auto Check Childs on Parent Check

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C#

ASP.NET

Hi
I'Ve created a dynamic tree view which will load its children on Demand when we click expand.

I want to check parent then its children should be auto created and expanded and check

unable to find a way to do it simply.

It is done using Postback when a node is checked then it is working fine but for every object postback is occuring whether or not nodes will be added to it

please help