后台动态生成静态select标签的option项

<select id="Category_<%#Eval("BTUserID") %>" name="Category_<%#Eval("BTUserID") %>" disabled on onchange=setHourlyCost("<%#Eval("BTUserID") %>") style="width:200px">
         <option value="0">User-Defined</option>
         <%=GetOptions4Arr() %>  /*动态为select添加option*/
</select>

 List<PCS.DAL.EF.Category> CategoryList = PCS.DAL.EF.Repository.GetInstance().GetCategoryList();
 List<PCS.DAL.EF.v_BTUser_Category> V_BTUser_Category = PCS.DAL.EF.Repository.GetInstance().GetUserCategory();
static List<PCS.DAL.EF.v_BTUser_Category> SourceComparer = new List<PCS.DAL.EF.v_BTUser_Category>();
 int SourceIndex = 0;

public void GetOrderedSource()//对数据源进行排序
{
var orderList = from l in V_BTUser_Category
orderby l.btuserfirstname, l.btuserlastname
select l;
SourceComparer = orderList.ToList();
}

public string GetOptions4Arr()
        {
            var btUserList = (from l in SourceComparer
                            orderby l.btuserfirstname, l.btuserlastname
                             select l).ToList() ;
            var orderList = from c in CategoryList
                            orderby c.Category1
                            select c;
            List<PCS.DAL.EF.Category> myList = orderList.ToList();/*以上为数据源部分，您可以做出相应的修改*/

            string options="";
            if (btUserList.Count > 0)
            {
                int categoryID = Convert.ToInt32(btUserList[SourceIndex].CategoryID);//此处取远数据的CategoryID值
                for (int i = 0; i < myList.Count; i++)
                {
　　　　　　　　　　　　//此处可以换成您想展示的数据
                    options += "<OPTION value=‘" + myList[i].CategoryID + "‘  title=‘" + myList[i].HourlyCost + "‘ id=‘" + myList[i].BillingRate + "‘";
                    if (categoryID == myList[i].CategoryID)//此处判断源数据（）与展示数据的相等ID项，若相等则选中，否则不指定selected属性                        options += "  selected=‘selected‘";

                    options += ">" + myList[i].Category1 + "</OPTION>";
                }
                if (SourceIndex < btUserList.Count)
                    SourceIndex++;
                else
                    SourceIndex = 0;
            }
            return options;
       
        }

function setHourlyCost(id)
        {
            var e=document.getElementById("HourlyCost_"+id);
            var temp=document.getElementById("Category_"+id);
            var eb=document.getElementById("BillingRate_"+id);
            if (temp.value=="0")
            {
       
                e.readOnly=false;
                e.style.backgroundColor="white"
                e.value=""
        
                eb.readOnly=false;
                eb.style.backgroundColor="white"
                eb.value=""
            }
            else
            {
                e.readOnly=true;
                e.style.backgroundColor="lightgrey"
                e.value=temp[temp.selectedIndex].title;/*将title属性值赋值给hourlycost控件的value属性*/
     
                eb.readOnly=true;
                eb.style.backgroundColor="lightgrey"
                eb.value=temp[temp.selectedIndex].id;/*将id属性值赋值给billingrate控件的value属性*/
    
            }
 
        }