You can remove textbox from your placeholder like below:
protected void Remove(object sender, EventArgs e)
{
foreach (Control control in PlaceHolder1.Controls)
{
//Here you need to take ID from ViewState["controlIdList"]
if (control.ID == "TakeIDFromControlListsID")
{
Controls.Remove(control);
}
}
}
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solved How to delete dynamically created textbox in asp.net