Hi,

You can use FindControl to get the control in Repeater.

        foreach (RepeaterItem Item in Repeater1.Items)
        {
            TextBox TextBoxEntry = (TextBox)Item.FindControl("TextBox1");
            string valueNew = TextBoxEntry.Text;
            Response.Write(valueNew);
        }

You can also use Repeater1.ItemDataBound event to set control in each item.

Hope it helps.