首先是在FRM_load里面写的代码是显示用户名的信息。
System.Data.SqlClient.SqlConnection cn = new System.Data.SqlClient.SqlConnection();
            cn.ConnectionString = "server=.;database=sms;uid=sa;pwd=;";
            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
             = "select username from tb_user";
            cmd.Connection = cn;
            cn.Open();
            System.Data.SqlClient.SqlDataReader sdr = cmd.ExecuteReader();

            while (sdr.Read())
            {
                string username = sdr.GetValue(0).ToString();

                cboxName.Items.Add(username);



            }



            cn.Close();
然后权限里面要显示权限的信息
 System.Data.SqlClient.SqlConnection cn = new System.Data.SqlClient.SqlConnection();
            cn.ConnectionString = "server=.;database=sms;uid=sa;pwd=;";
            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
             = "select userpurview from tb_user where username='"+cboxName.Text+"'";
            cmd.Connection = cn;
            cn.Open();
            System.Data.SqlClient.SqlDataReader sdr = cmd.ExecuteReader();

            while (sdr.Read())
            {
                string userpurview = sdr.GetValue(0).ToString();
                cboxPurview.Items.Add(userpurview);

            }



            cn.Close();
哪位高手看看显示权限那里哪错了，
最后要求是：1.权限里包括普通用户是管理员，（1普通用户只能修改自己权限）
                                             （2管理员可修改任何人）

都不知道提示什么错误，cboxPurview是什么？