protected void BtnLoad_Click(object sender, EventArgs e)

         {

             //dataDR datadr = new dataDR();

             //datadr.delete("delete from dbo.yuepingjueyuerbiao");

             string fileName = DateTime.Now.ToString("yyMMddhhmmss") + ".xls";

             string path = Server.MapPath("~/upload/excel/") + fileName;

             FileUpload1.SaveAs(path);

             if (path != null)

             {

                DataSet ds=loadSouce(path);

             }

             else

             {

                 Response.Write("<script>alert('没有上传文件')</script>");

             }

         }

         protected void Button1_Click(object sender, EventArgs e)

         {

             CreateExcel(helps.GetDataTable("select * from tb_teacher"), "Test.xls");

         }

  <div>

             <asp:FileUpload ID="FileUpload1" runat="server" /><asp:Button ID="BtnLoad" runat="server" Text="上传" OnClick="BtnLoad_Click" />

         </div>

         <asp:Button ID="Button1" runat="server" Text="下载" style="height: 21px" OnClick="Button1_Click" />

  private DataSet loadSouce(string path)

         {

             //连接EXCEL数据源

             //string strPath = this.getPath();

             //string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=" + "\"" + "Excel 8.0;HDR=Yes;IMEX=1" + "\"";

             // string strConn = "Provider = Microsoft.ACE.OLEDB.12.0;Data Source =" + path + ";Extended Properties='Excel 12.0;HDR=Yes;IMEX=1'";

             string strConn = "Provider = Microsoft.ACE.OLEDB.15.0;Data Source =" + path + ";Extended Properties='Excel 12.0;HDR=Yes;IMEX=1'";

             //此连接可以操作.xls与.xlsx文件 (支持Excel2003 和 Excel2007 的连接字符串)

             //备注： "HDR=yes;"是说Excel文件的第一行是列名而不是数据，"HDR=No;"正好与前面的相反。

             //      "IMEX=1 "如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。 

             OleDbConnection conn = new OleDbConnection(strConn);

             conn.Open();

             /*

              如果用户把sheet表名改了就是报下面的错：

             'sheet1$' 不是一个有效名称。请确认它不包含无效的字符或标点，且名称不太长。

             如果可以动态获得Excel中各个sheet的名称能动态的选中返回哪个sheet的数据，

             即使用户更改了名称也不怕，完全可以把所有sheet的名称列出来供用户选择:

             下面就把解决问题的代码列出来，主要用到了OleDbConnection.GetOleDbSchemaTable()方法

              */

             //返回Excel的架构，包括各个sheet表的名称,类型，创建时间和修改时间等

             System.Data.DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });

             //包含excel中表名的字符串数组

             string[] strTableNames = new string[dtSheetName.Rows.Count];

             for (int k = ; k < dtSheetName.Rows.Count; k++)

             {

                 strTableNames[k] = dtSheetName.Rows[k]["TABLE_NAME"].ToString();

             }

             //OleDbDataAdapter myCommand = null;

             System.Data.DataTable dt = new System.Data.DataTable();

             //从指定的表明查询数据,可先把所有表明列出来供用户选择

             string strExcel = "select * from [" + strTableNames[] + "]";

             OleDbDataAdapter myCommand = new OleDbDataAdapter(strExcel, strConn);

             DataSet myDataSet = new DataSet();

             myCommand.Fill(myDataSet);

             return myDataSet;

         }

  private void CreateExcel(System.Data.DataTable dt, string fileName)

         {

             HttpResponse resp;

             resp = Page.Response;

             resp.Buffer = true;

             resp.ClearContent();

             resp.ClearHeaders();

             resp.Charset = "GB2312";

             //  resp.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");

             resp.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);

             resp.ContentEncoding = System.Text.Encoding.Default;//设置输出流为简体中文

             resp.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。 

             string colHeaders = "", ls_item = "";

             ////定义表对象与行对象，同时用DataSet对其值进行初始化

             //DataTable dt = ds.Tables[0];

             DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的

             int i = ;

             int cl = dt.Columns.Count;

             // colHeaders += "tttttttt" + "\n";

             //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 = ; i < cl; i++)

             {

                 if (i == (cl - ))//最后一列，加n

                 {

                     colHeaders += dt.Columns[i].Caption.ToString().Trim() + "\n";

                 }

                 else

                 {

                     colHeaders += dt.Columns[i].Caption.ToString().Trim() + "\t";

                 }

             }

             resp.Write(colHeaders);

             //向HTTP输出流中写入取得的数据信息

             //逐行处理数据

             foreach (DataRow row in myRow)

             {

                 //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据

                 for (i = ; i < cl; i++)

                 {

                     if (i == (cl - ))//最后一列，加n

                     {

                         ls_item += row[i].ToString().Trim() + "\n";

                     }

                     else

                     {

                         ls_item += row[i].ToString().Trim() + "\t";

                     }

                 }

                 resp.Write(ls_item);

                 ls_item = "";

             }

             resp.End();

         }