asp.net导出EXCEL问题！ - .NET技术 / ASP.NET

C# code:

SqlConnection conn = CsDB.sqlcon();
SqlDataAdapter da = new SqlDataAdapter("select fwCoding from bjmuma_fwCoding where OrderNumber='" + Order + "'", conn);
DataSet ds = new DataSet();
da.Fill(ds, "table1");
DataTable dt = ds.Tables["table1"];
StringWriter sw = new StringWriter();
sw.WriteLine("test", "vnd.ms-excel.numberformat:@");
foreach (DataRow dr in dt.Rows)
{
sw.WriteLine(dr["fwCoding"]);
}

//string execlname = CsDB.GetSear(Coding);
sw.Close();
// foreach (DataGridItem dg in this.DataGrid1.Items) { dg.Cells[列].Attributes.Add("style", "vnd.ms-excel.numberformat: @;"); } this.DataGrid1.RenderControl(hw);
//DateTime.Now.ToString("yyyyMMdd_hhmm")
Response.AddHeader("Content-Disposition", "attachment; filename=" + CsDB.GetSear(Order) + ".csv");
Response.ContentType = "application/ms-excel";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Respons