How can I make textboxes active and inactive on selecting specific items from the dropdown list using jQuery?

<td>&nbsp;@Html.LabelFor(model => model.DeductorType)</td>
               <td>
                   @{ List<SelectListItem> li = new List<SelectListItem>();
                    li.Add(new SelectListItem { Text = "Select", Value = "0", Selected = true });
                    li.Add(new SelectListItem { Text = "A-Central Government", Value = "A-Central Government"});
                    li.Add(new SelectListItem { Text = "B-Body Of Individuals", Value = "B-Body Of Individuals" });
                    li.Add(new SelectListItem { Text = "D-Satutary Body(Central Govt.)", Value = "D-Satutary Body(Central Govt.)" });
                    li.Add(new SelectListItem { Text = "E-Satutary Body(State Govt.)", Value = "E-Satutary Body(State Govt.)" });
                    li.Add(new SelectListItem { Text = "F-Firm", Value = "F-Firm" });
                    li.Add(new SelectListItem { Text = "G-Autonomous Body(Central Govt.)", Value = "G-Autonomous Body(Central Govt.)" });
                    li.Add(new SelectListItem { Text = "H-Autonomous Body(State Govt.)", Value = "H-Autonomous Body(State Govt.)" });
                    li.Add(new SelectListItem { Text = "J-Artificial Juridical Person", Value = "J-Artificial Juridical Person" });
                    li.Add(new SelectListItem { Text = "K-Company", Value = "K-Company" });
                    li.Add(new SelectListItem { Text = "L-Local Authority(Central Govt.)", Value = "L-Local Authority(Central Govt.)" });
                    li.Add(new SelectListItem { Text = "M-Branch/Division of Company", Value = "M-Branch/Division of Company" });
                    li.Add(new SelectListItem { Text = "N-Local Authority(State Govt.)", Value = "N-Local Authority(State Govt.)" });
                    li.Add(new SelectListItem { Text = "P-Association of Person(AOP)", Value = "P-Association of Person(AOP)" });
                    li.Add(new SelectListItem { Text = "Q-Individual/HUF", Value = "Q-Individual/HUF" });
                    li.Add(new SelectListItem { Text = "S-State Government", Value = "S-State Government" });
                    li.Add(new SelectListItem { Text = "T-Association of Person(Trust)", Value = "T-Association of Person(Trust)" });
               }
               &nbsp;@Html.DropDownListFor(model => model.DeductorType, li, new { style = "width:160px"})
               @Html.ValidationMessageFor(model => model.DeductorType)
           </td>