Remove Null Items From The Dropdownlist

protected void Button1_Click(object sender, EventArgs e) {      for (int i = 0; i < DropDownList1.Items.Count; i++)      {                 //Here It Will Check Fro the Empty value...                 if (DropDownList1.Items[i].Value == "")                 {                     //If Found Then Remove That Value From The DropdownList...                     DropDownList1.Items.Remove();       } }         }