将datagrid控件内容输出到excel文件

public void setToExcel() 
{ 
// Response.Clear(); 
// Response.Buffer= true; 
// Response.Charset="utf-8";　　 

if (eformsn.Text=="") 
{ 
DataGrid1.Visible=false; 
Label1.Text="要汇入EXCEL，请先输入申请单号!"; 
Label1.Visible=true; 
} 
else 
{ 
dl.DataSource=DB("query", "select * from msi_eol_list_line where eformsn="+eformsn.Text+" order by eformsn").Tables[0].DefaultView; 
dl.DataBind(); 

//下面这行很重要，attachment 参数表示作为附件下载，您可以改成online在线打开 
//filename=FileFlow.xls 指定输出文件的名称，注意其扩展名和指定文件类型相符，可以为：.doc .xls .txt .htm　　 

Response.AppendHeader("Content-Disposition","attachment;filename=EOL_"+eformsn.Text+".xls"); 
Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");　 

//Response.ContentType指定文件类型 可以为application/ms-excel,application/ms-word ,application/ms-txt,application/ms-html或其他浏览器可直接支持文档　 
Response.ContentType = "application/ms-excel"; 
dl.EnableViewState = false;　 

System.IO.StringWriter oStringWriter = new System.IO.StringWriter(); 
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter); 

//将目标数据绑定到输入流输出　　 
//this 表示输出本页，你也可以绑定datagrid,或其他支持obj.RenderControl()属性的控件　　 
dl.RenderControl(oHtmlTextWriter); 
//this.DataBind.RenderControl(oHtmlTextWriter); 
Response.Write(oStringWriter.ToString()); 
Response.End(); 
} 
}