using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
public static string username;
public Form2 form2 = null; //定义窗体
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button3_Click(object sender, EventArgs e)
{
username = "123456";
MessageBox.Show(username);
if (form2 == null) //判断窗体是否存在
{
form2 = new Form2();
form2.Show();
this.Hide();
}
}
}
}