C# 在web页面汇出excel格式内容！

/**//// <summary>
        /// 匯出Excel
        /// </summary>
        /// <param name="ds">數據集</param>
        public static void InitExcel(DataSet ds)
        ...{
            DataGrid dgExport = null;
            StringWriter strWriter = null; 
            HtmlTextWriter htmlWriter = null; 
            System.Data.DataTable dt = ds.Tables[0];
            for( int i=0; i < dt.Rows.Count; i++ ) 
            ...{
                for( int j=0; j < dt.Columns.Count; j++ )
                ...{
                    string temp = dt.Rows[i][j].ToString();
                    bool flag = false;
                    while(temp.IndexOf(" ") != -1)
                    ...{
                        temp = temp.Replace(" "," <br> ");
                        flag = true;
                    }
                    if( flag )
                        dt.Rows[i][j] = temp;
                }
            }
            if( dt != null ) 
            ...{
                HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
                HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
                HttpContext.Current.Response.Charset = "";
                strWriter = new StringWriter();
                htmlWriter = new HtmlTextWriter(strWriter);

                dgExport = new DataGrid();
                dgExport.DataSource = dt.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.HeaderStyle.ForeColor = System.Drawing.Color.White;
                dgExport.HeaderStyle.BackColor = System.Drawing.Color.Gray;
                dgExport.DataBind();

                dgExport.RenderControl(htmlWriter);
                HttpContext.Current.Response.Write(strWriter.ToString());
                HttpContext.Current.Response.End();
            }
        }