登录问题

Question

 string name =this.textBox1.ToString().Trim();
            string pwd = this.textBox2.ToString().Trim();
            string contr = "Data Source=.;Initial Catalog=ptang;Integrated Security=True";
            using (SqlConnection con = new SqlConnection(contr)) {
                con.Open();
                string sql = "select * from School where username='" + name + "'";
                using (SqlCommand cmd = new SqlCommand(sql,con)) {
                    using (SqlDataReader reader = cmd.ExecuteReader()) {
                        if (reader.Read())
                        {
                            string dbpwd = reader.GetString(reader.GetOrdinal("password"));
                            if (pwd == dbpwd)
                            {
                                MessageBox.Show("登录成功！");
                            }
                            else {
                                MessageBox.Show("密码错误");
                            }
                        }
                        else {
                            MessageBox.Show("用户名错误！");
                        }
连接数据库登录，其中数据库字段及数据类型
username varchar(20),password varchar(50)
每次输入用户名与密码都弹出“用户名错误”.怎么会每次都没有查询到用户名，是数值类型的关系吗

Answer 1

string name =this.textBox1.Text.Trim();
            string pwd = this.textBox2.Text.Trim();
lz写代码仔细点，不要犯这么低级的错误