we need to do populate dropdownlist from database in dynamic

Hello Ankit Jain

Please use these links for your query

https://www.aspsnippets.com/Articles/Save-Insert-dynamic-DropDownList-Selected-Value-to-database-in-ASPNet-using-C-and-VBNet.aspx

https://www.aspsnippets.com/Articles/Adding-Dynamic-Rows-in-GridView-with-DropDownLists-in-ASP.Net.aspx

https://www.c-sharpcorner.com/UploadFile/8c19e8/dynamically-adding-and-deleting-rows-in-gridview-and-saving/

http://www.encodedna.com/aspdotnet/programmatically-create-and-add-dropdownlist-to-gridview-in-csharp.htm