麻烦大家帮忙看看怎么老是显示这句错误: OleDbCommand cmd = new OleDbCommand(sqlstr, conn);提示信息是:无法从OleDbConnection 转换为system.data.oledb.oledb OleDbConnection
using System;
using System.Collections.Generic;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
……
……
conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" +MapPath("App_Data /assumpsit.accdb)+"'");
conn.Open();
if (user_id == "" || user_password == "")
{ Response.Redirect("login.aspx?mess=密码或工号必须填写"); }
try //检查是否合法用户
{
string sqlstr = "select * from teacher where 工号='" + user_id + "' and 密码='" + user_password
+ "'";
OleDbCommand cmd = new OleDbCommand(sqlstr, conn);
rs = cmd.ExecuteReader();