Dim zhanghao As String = "zhouwei"
Dim mima As String = "mima"
If TextBox1.Text = zhanghao And TextBox2.Text = mima Then
MessageBox.Show("登录成功")
主界面.Show()
Else
MessageBox.Show("帐号或密码错误")
End If
现在帐号密码在sql数据库 代码要怎么改