using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
}

拜托不要沉 - -

只会用vs的桌面vb语句写。。。
如果用vs2013的vb写(程序在botton登陆里面):
if textbox1.text="账户" then
if textbox2.text="密码" then
me.hide
form2.show()
end if
endif