DAL： public SqlDataReader GetAdminNameAndPassword()
        {
            SqlConnection conn = connectionManger.GetConnectionStr();
            SqlDataReader dr = null;
            try
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand("select AdminName,AdminPassword from [dbo].[T_Admin]", conn);
                dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                dr.Read();
            }
            catch (SqlException se)
            {
                throw se;
            }
            finally
            {
                //dr.Dispose();
                //dr.Close();
                if (conn.State != System.Data.ConnectionState.Closed)
                {
                    conn.Close();
                }
                conn.Dispose();
            }
            return dr;
        }
BLL：.......省略
界面后台代码： protected void GetAdminNameAndPassword()
        {
            SqlDataReader dr = new BBSBBL.T_AdminInfo().GetAdminNameAndPassword();
            dr.Read();
            this.txtAdminName.Text = dr.GetString(0);
            this.txtAdminPassword.Text = dr.GetString(1);
        }
错误提示：阅读器关闭时尝试调用 Read 无效
         
行 24:         {
行 25:             SqlDataReader dr = new BBSBBL.T_AdminInfo().GetAdminNameAndPassword();
行 26:             dr.Read();-------此行代码是红色的
行 27:             this.txtAdminName.Text = dr.GetString(0);
行 28:             this.txtAdminPassword.Text = dr.GetString(1);