使用iTextSharp将DataTable导出为多种格式

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Collections.Generic;
//using iTextSharp.text;
//using iTextSharp.text.pdf;
using System.IO;
using System.Text;
//using iTextSharp.text.html;
using System.Xml;
using iTextSharp;
using iTextSharp.text;
using iTextSharp.text.pdf; 
using System.Reflection;

namespace zjf.Utility
{
    public class Print
    {
        /// <summary>
        //导出word文件
        /// </summary>

        /// <param name="FileType"></param>
        /// <param name="FileName"></param>
        public void ExportToDoc(string FileName, System.Web.UI.Control control)
        {
            string strFileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + strFileName + ".doc");
            HttpContext.Current.Response.ContentType = "application/ms-word";

            control.EnableViewState = false;
            System.IO.StringWriter swOut = new System.IO.StringWriter();
            HtmlTextWriter hTw = new HtmlTextWriter(swOut);

            control.RenderControl(hTw);
            HttpContext.Current.Response.Write(swOut.ToString());//////////////////////去除字符
            HttpContext.Current.Response.End();


        }
        /// <summary>
        /// 导出EXCEl文件
        /// </summary>
        /// <param name="FileType"></param>
        /// <param name="FileName"></param>
        public void ExportToExcel(string FileName, System.Web.UI.Control control)
        {
            string strFileName = System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + strFileName + ".xls");