//Método getInstance()
public static frmPrincipal getInstance()
{
if (instance == null)
{
instance = new frmPrincipal();
}
return instance;
}
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
frmLogin frmLogin = new frmLogin();
frmPrincipal frmPrincipal = new Frames.frmPrincipal();
Application.Run(frmLogin);
if (frmLogin.DialogResult == DialogResult.OK)
Application.Run(new frmPrincipal());
}
//Método FormClosing
private void frmPrincipal_FormClosing(object sender, FormClosingEventArgs e)
{
instance = null;
}