Csharp Datatable sort

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Data;

namespace Geovin.Du.FormOperatingBase
{
    /// <summary>
    /// ComboBox 綁定值或索引值
    /// 20110909
    /// 塗聚文 締友計算機信息技術有限公司
    /// </summary>
   public class SetComBoxDataBinding
    {
       public enum strSort
       {
           Desc,
           Asc
       };
       /// <summary>
        /// ComboBox 綁定值
       /// </summary>
        /// <param name="sComboBox">combox 控件名称</param>
        /// <param name="sFieldName">显示的名称</param>
        /// <param name="sFieldNameValue">所显示的ID或值</param>
       /// <param name="dt"></param>
       public static void setComboList(ComboBox sComboBox, string sFieldName, string sFieldNameValue,DataTable dt)
       {
           //原用的
           sComboBox.DataSource = dt.DefaultView;//           
           sComboBox.DisplayMember = sFieldName;//显示字段
           sComboBox.ValueMember = sFieldNameValue;//字段值,如ID
           //dt.Dispose();
           //dt.Clear();

       }
       /// <summary>
       ///  ComboBox 綁定值 並索引
       /// 20120905
       /// 塗聚文 締友計算機信息技術有限公司
       /// </summary>
       /// <param name="sComboBox">ComboBox</param>
       /// <param name="sFieldName">显示的名称</param>
       /// <param name="sFieldNameValue">屬性值</param>
       /// <param name="dt">索引的值</param>
       /// <param name="strSort"></param>
       public static void setComboSortList(ComboBox sComboBox, string sFieldName, string sFieldNameValue, DataTable dt,strSort sort)
       {
           
           //原用的
           switch (sort)
           {
               case strSort.Asc:
                   dt.DefaultView.Sort = sFieldName + " Asc";
                   break;
               case strSort.Desc:
                   dt.DefaultView.Sort = sFieldName + " Desc";
                   break;
 
           }
           
           sComboBox.DataSource = dt.DefaultView;//           
           sComboBox.DisplayMember = sFieldName;//显示字段
           sComboBox.ValueMember = sFieldNameValue;//字段值,如ID
           //dt.Dispose();
           //dt.Clear();

       }
       /// <summary>
       /// State, ZipCode DESC
       /// </summary>
       /// <param name="dt">DataTable</param>
       /// <param name="str">State, ZipCode DESC</param>
       private void SortByTwoColumns(DataTable dt,string str)
       {
           
           DataView view = dt.DefaultView;           
           view.Sort = str;
       }
    }
}