Dynamically Created Controls losing data after postback

All you need to do is to re-instantiate / reinitialize dynamic controls before or within page load event each and every time during postback and add this control to page / forms / placeholders. Then, the posted data will automatically be assigned to the control by calling the LoadPostData method by the parent control.

check the article and how to write code for dynamic control –
How to maintain dynamic control events, data during postback in asp.net

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