double amt = 0;
            foreach (Control c in panel1.Controls)
            {
                amt = amt + long.Parse(((MediRow)c).Controls.Find("textBox1",true)[0].Text);
            }
            lblAmt.Text = amt.ToString();

class MyCustomItem
{

  public string ItemName
  {
    get { return TxtName.Text; }
  }

  public string ItemQuantity
  {
    get { return TxtQuantity.Text; }
  }


  // other logic here
}