private void button1_Click(object sender, EventArgs e) { user.userName = textBox1.Text.Trim(); user.password = textBox2.Text.Trim(); if (user.userName == "") { MessageBox.Show("请输入用户名!"); return; } if (user.password == "") { MessageBox.Show("请输入密码!"); return; } if (textBox3.Text == "") { MessageBox.Show("请输入修改密码!"); return; } int count = userBll.Query(user); if (count > 0) { user.password = textBox3.Text.Trim(); userBll.Fix(user); MessageBox.Show("修改成功"); } else { MessageBox.Show("用户名或密码错误"); } }