asp.net 导出到CSV文件乱码的问题

http://social.microsoft.com/forums/zh-cn/295/thread/14a833f5-95bf-48ef-b6cf-c6028f338561

string name = system.configuration.configurationsettings.appsettings["downloadurl"].tostring();
filestream fs = new filestream(name, filemode.create, fileaccess.write);
streamwriter sw = new streamwriter(fs, system.text.encoding.getencoding("gb2312"));

sw.writeline(" 自动编号,姓名,年龄");
foreach (datarow dr in dt.rows)
{
sw.writeline(dr["id"] + "," + dr["vname"] + "," + dr["iage"]);
}
sw.close();
response.addheader("content-disposition", "attachment; filename=" + server.urlencode(name));
response.contenttype = "application/ms-excel";// 指定返回的是一个不能被客户端读取的流，必须被下载
response.writefile(name); // 把文件流发送到客户端
response.end();

重点为红色标记处！

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string strfile = "filename" + datetime.now.tostring("yyyymmddhhmmss") + ".csv";

//这一部分替换为你从datatable/gridview获取的内容
stringbuilder sb = new stringbuilder();
sb.appendline("id,name");
sb.appendline("1,邹俊才");
sb.appendline("2,才俊邹");
sb.appendline("3,jon");

stringwriter sw = new stringwriter(sb);
sw.close();

response.addheader("content-disposition", string.format("attachment;filename={0}", strfile));
response.charset = "gb2312";
response.contenttype = "application/ms-excel";
response.contentencoding = system.text.encoding.getencoding("gb2312");
response.write(sw);
response.flush();
response.end();