C# can not jump page, three-tier architecture

namespace TomSmartERP.UI
{
    public partial class LoginWindow : Form
    {
        public LoginWindow()
        {
            InitializeComponent();
        }

        
        

        private void btnLogin_Click(object sender, EventArgs e)
        {
            //UI层将用户输入数据传递给BLL层
            string userName = txtUserName.Text.Trim();
            string password = txtPassword.Text;
            TomSmartERPBLL.LoginManager mgr = new TomSmartERPBLL.LoginManager();
            TomSmartERPMODEL.UserInfo user = mgr.UserLogin(userName, password);
            
            //将UI层返回业务层传递的数据给用户
            MessageBox.Show("登陆用户：" + user.UserName);
            this.DialogResult = DialogResult.OK;
            this.Dispose();
            this.Close();
            //this.Form2();
        }

        private void txtUserName_TextChanged(object sender, EventArgs e)
        {

        }
    }
}

    internal static class Program
    {
        /// 

        /// 应用程序的主入口点。
        /// 
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new LoginWindow());
            LoginWindow Form1 = new LoginWindow();
           
           // Form1.ShowDialog();
            if (Form1.ShowDialog() == DialogResult.OK)
            {

               
                //运行form2窗体
                //Form2 form2 = new Form2();
                Application.Run(new Form2());
            }
            
        }
    }
    
}