Hi,
Please refer below link
http://www.aspforums.net/Threads/654022/Maintain-Dynamic-DropDownList-and-TextBoxes-created-using-jQuery-on-PostBack-in-ASPNet/
I have not maintained Data using Database, I have maintained it client side.as you have asked to save into database that is why i have added database saving part, so just remove saving part i.e. remove below code.
Data data = new Data
{
DropDownListValue = Request.Form["ddl" + hfDropDownIds.Value.Split(',')[i]],
textBox1Value = textboxValues[count - 1],
textBox2Value = textboxValues[count]
};
and
SaveData(data);
and remove SaveData method implementation also Data Class.
I hope this will help you out