C#将DataTable导出Execl、Word、Xml

    /// <summary>
    /// 将DT转换为Execl的方法
    /// </summary>
    /// <param name="dt">需要导出的DT
    /// <param name="page">页面
    /// <param name="fileName">文件名
    public void ToExecl(DataTable dt, Page page, string fileName)
    {
        HttpResponse response = page.Response;
        response.Clear();
        response.ContentType = "application/x-excel";
        response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) + ".xls");
        StringBuilder sB = new StringBuilder();
        for (int j = ; j < dt.Columns.Count; j++)
        {
            sB.Append(dt.Columns[j].Caption + "\t");
        }
        sB.Append("\n");
        for (int i = ; i < dt.Rows.Count; i++)
        {
            for (int k = ; k < dt.Columns.Count; k++)
            {
                sB.Append("=\"" + dt.Rows[i][k].ToString() + "\"\t"); //解决导出的单元格以科学计数法显示的问题
            }
            sB.Append("\n");
        }
        response.Write(sB.ToString());
        response.End();
    }

public void ToWord(DataTable dt, Page page, string filName)
   {
       HttpResponse response = page.Response;
       response.Clear();
       response.ContentType = "application/msword";
       response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
       response.AddHeader("Content-Disposition","attachment:filename="+System.Web.HttpUtility.UrlEncode(filName,System.Text.Encoding.UTF8)+".doc");
       StringBuilder sBuilder = new StringBuilder();
       for (int i = ; i < dt.Rows.Count; i++)
       {
           sBuilder.Append(dt.Rows[i][].ToString()+"\n");
       }
       response.Write(sBuilder.ToString());
       response.End();
   }  

public void ToXML(DataTable dt, Page page, string filename)
{
    HttpResponse response = page.Response;
    //DataSet ds = new DataSet();
    response.Clear();
    response.ContentType = "application/x-excel";
    response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
    response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename,System.Text.Encoding.UTF8) + ".xls");
    System.Text.UTF8Encoding utf8 = new System.Text.UTF8Encoding();
    System.Xml.XmlTextWriter xw = new XmlTextWriter(response.OutputStream, utf8);
    xw.Formatting = Formatting.Indented;
    xw.Indentation = ;
    xw.IndentChar = ' ';
    dt.TableName = "dd";
    dt.WriteXml(xw);
    dt = null;
    GC.Collect();
    xw.Flush();
    xw.Close();
    response.End();
}  

来源：http://blog.csdn.net/smartsmile2012/article/details/8182862