protected void studentload_Click(object sender, EventArgs e)        {
    //批量添加学生信息           SqlConnection conn = DB.dataBaseConn();//链接数据库           conn.Open();             try             {               string fileurl = typename(studentFileUpload);//调用typename方法取得excel文件路径               DataSet ds = new DataSet();//取得数据集               ds = xsldata(fileurl);               int errorcount = 0;//记录错误信息条数               int insertcount = 0;//记录插入成功条数               int updatecount = 0;//记录更新信息条数                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)               {                   string stuid = ds.Tables[0].Rows[i][0].ToString();                   string stuname = ds.Tables[0].Rows[i][1].ToString();                   string stusex = ds.Tables[0].Rows[i][2].ToString();                   string zhuanye = ds.Tables[0].Rows[i][3].ToString();                   string classname = ds.Tables[0].Rows[i][4].ToString();                   if (stuid != "" && stuname != "" && stusex != "" && zhuanye != "" && classname != "")                   {                                    SqlCommand selectcmd = new SqlCommand("select count(*) from zy_class   where zhuanye='" + zhuanye + "'and classname='" + classname + "'", conn);                       int count = Convert.ToInt32(selectcmd.ExecuteScalar());                       if (count > 0)                       {                           SqlCommand selectcmd2 = new SqlCommand("select count(*) from stud where   stuid='" + stuid + "'", conn);                          int count2 = Convert.ToInt32(selectcmd2.ExecuteScalar());                           if (count2 > 0)                           {                               SqlCommand updatecmd = new SqlCommand("update stud set   stuname='" + stuname + "',stusex='" + stusex + "',zhuanye='" + zhuanyei + "',classname='" + classname + "'   where stuid='" + stuid + "'", conn);                              updatecmd.ExecuteNonQuery();                               updatecount++;                           }                          else                          {                               SqlCommand insertcmd= new SqlCommand("insert into stud    values('" + stuid + "','" + stuname + "','" + stusex + "','" + zhuanye + "','" + classname+ "')", conn);                               insertcmd.ExecuteNonQuery();                               insertcount++;                           }                       }                       else                       {                           Response.Write("");                           break;                           }                   }                  else                   {                       errorcount++;                   }              }               Response.Write("");           }           catch (Exception e)           {               Response.Write("");           }           finally           {             conn.Close();           }           }    //把EXCEL文件上传到服务器并返回文件路径    private String typename(FileUpload fileloads)       {           string fullfilename = fileloads.PostedFile.FileName;           string filename = fullfilename.Substring(fullfilename.LastIndexOf("\\") + 1);          string type = fullfilename.Substring(fullfilename.LastIndexOf(".") + 1);           string murl = "";           if (type == "xls")          {               fileloads.PostedFile.SaveAs(Server.MapPath("excel") + "\\" + filename);              murl = (Server.MapPath("excel") + "\\" + filename).ToString();           }           else           {               Response.Write("");             }           return murl;       }        //把excel数据读入dataset返回l数据集       private DataSet xsldata(string filepath)       {          string strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties='Excel 8.0;IMEX=1'";          System.Data.OleDb.OleDbConnection Conn = new System.Data.OleDb.OleDbConnection(strCon);          string strCom = "SELECT * FROM [Sheet1$]";          Conn.Open();          System.Data.OleDb.OleDbDataAdapter myCommand = new System.Data.OleDb.OleDbDataAdapter(strCom, Conn);           DataSet ds = new DataSet();          myCommand.Fill(ds, "[Sheet1$]");          Conn.Close();          return ds;     }