protected void ExportExcel_Bn_Click(object sender, EventArgs e)
        {
            FileInfo File = new FileInfo(Server.MapPath("_resourses\\UpExcel\\StudentModel.xls"));//Excel文件模板

string sql = "select XH as 学号,XM as 姓名,XB as 性别,YXDM as 院系代码,ZYDM as 专业代码,BJDM as 班级代码,XJZT as 学籍状态,CSNY as 出生年月,SYD as 生源地,JGM as 籍贯,SFZH as 身份证号,MZ as 民族编码,ZZMM as 政治面貌码 from T_YXSJZB_XSJBXX where BDPCBH='" + BDPCBH.SelectedValue + "'";
            DataSet ds = DataHelper.GetDataSet(sql);

string NewAddStudent = Server.MapPath("_resourses\\UpExcel\\StudentOutFull.xls");//填充新文件为Excel文件的名称

FileInfo NewFile = new FileInfo(NewAddStudent);//实例新文件Excel文件

if (NewFile.Exists)  //判断新文件是否存在
            {
                NewFile.Delete(); //删除文件
                File.CopyTo(NewAddStudent);//复制新文件
                SavetoExcel(NewAddStudent, ds);//把数据写入excel
                Response.Redirect("_resourses\\UpExcel\\StudentOutFull.xls");

}
            else
            {
                File.CopyTo(NewAddStudent);//复制新文件
                SavetoExcel(NewAddStudent, ds);//把数据写入excel
                Response.Redirect("_resourses\\UpExcel\\StudentOutFull.xls");

}

//string path = Server.MapPath("_resourses\\UpExcel\\学生信息");

//if (File.Exists)
            //{
            //    ExcelCtrol.DelExcel(Server.MapPath("_resourses\\UpExcel\\学生信息.xls"));
            //    ExcelCtrol.ToExcel(ds, path);
            //    Response.Redirect("_resourses\\UpExcel\\学生信息.xls");
            //}
            //else
            //{
            //    ExcelCtrol.ToExcel(ds, path);
            //    Response.Redirect("_resourses\\UpExcel\\学生信息.xls");
            //}

}

public bool SavetoExcel(string Path, DataSet ds)
        {
            try
            {
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                System.Data.OleDb.OleDbCommand cmd = new OleDbCommand();
                cmd.Connection = conn;

int RowCount = ds.Tables[0].Rows.Count;
                for (int j = 0; j < RowCount; j++)
                {

string xh = ds.Tables[0].Rows[j][0].ToString();//学号
                    string xm = ds.Tables[0].Rows[j][1].ToString();//姓名
                    string xb = ds.Tables[0].Rows[j][2].ToString();//性别
                    string xy = ds.Tables[0].Rows[j][3].ToString();//院系代码
                    string zy = ds.Tables[0].Rows[j][4].ToString();//专业代码
                    string bj = ds.Tables[0].Rows[j][5].ToString();//班级代码
                    string xj = ds.Tables[0].Rows[j][6].ToString();//学籍状态
                    string CSNY = ds.Tables[0].Rows[j][7].ToString();//出生年月
                    string syd = ds.Tables[0].Rows[j][8].ToString();//生源地
                    string jg = ds.Tables[0].Rows[j][9].ToString();//籍贯
                    string sfz = ds.Tables[0].Rows[j][10].ToString();//身份证号
                    string mz = ds.Tables[0].Rows[j][11].ToString();//民族编码
                    string zz = ds.Tables[0].Rows[j][12].ToString();//政治面貌码
                    cmd.CommandText = "INSERT INTO [sheet1$] (学号,姓名,性别,院系代码,专业代码,班级代码,学籍状态,出生年月,生源地,籍贯,身份证号,民族编码,政治面貌码) VALUES('" + xh + "','" + xm + "','" + xb + "','" + xy + "','" + zy + "','" + bj + "','" + xj + "','" + CSNY + "','" + syd + "','" + jg + "','" + sfz + "','" + mz + "','" + zz + "')";
                    cmd.ExecuteNonQuery();

}
                conn.Close();
                cmd.Dispose();
                return true;

}
            catch (System.Data.OleDb.OleDbException ex)
            {
                System.Diagnostics.Debug.WriteLine("写入Excel发生错误：" + ex.Message);
            }
            return false;
        }