1 $(document).ready(function () {
 2     $.ajax({
 3         timeout: 3000,
 4         async: false,
 5         type: "POST",
 6         url: "WareHouse.ashx",
 7         dataType: "json",
 8         data: {
 9             warehouse: $("#issued_sub_key_c").val(),
10         },
11         success: function
 
 (data) {
12             for (var i = 0; i < data.length; i++) {
13                 $("#issued_sub_key_c").append("<option>" + data[i].Name + "</option>");
14             }
15         }
16     });
17 });

1 <select id="issued_sub_key_c" name="issued_sub_key_c">
2 
3 </select>