asp.net dataset 导出excel

/// <summary>
/// excel 数据导出
/// </summary>
/// <param name="ds"></param>
/// <param name="FileName"></param>
public void CreateExcel(DataSet ds, string FileName)
{
HttpResponse resp;
resp = Page.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
string colHeaders = "", ls_item = "";
int i = 0;

//定义表对象和行对像，同时用DataSet对其值进行初始化
DataTable dt = ds.Tables[0];
DataRow[] myRow = dt.Select("");

//取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符
for (i = 0; i < dt.Columns.Count; i++)
{
if (i == dt.Columns.Count - 1)
{
colHeaders += dt.Columns[i].Caption.ToString() + "\n";
}
else
{
colHeaders += dt.Columns[i].Caption.ToString() + "\t";
}
}
//向HTTP输出流中写入取得的数据信息
resp.Write(colHeaders);
//逐行处理数据
foreach (DataRow row in myRow)
{
//在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n
for (i = 0; i < dt.Columns.Count; i++)
{

if (i == dt.Columns.Count - 1)
{
ls_item += row[i].ToString() + "\n";
}
else
{
ls_item += row[i].ToString() + "\t";
}
}
//当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
resp.Write(ls_item);
ls_item = "";
}

//写缓冲区中的数据到HTTP头文档中
resp.End();
}