winform登录窗体加载等待图片

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace NewAgencyTreasure
{
    public partial class frmLogin : DevComponents.DotNetBar.Office2007Form
    {   
        public delegate void delLogin();
        Thread myrhre;
        delLogin delsetpicvisible;
        delLogin delclose;
        string username = string.Empty;
        string password = string.Empty;
        public frmLogin()
        {
            InitializeComponent();
        }

        private void frmLogin_Load(object sender, EventArgs e)
        {

        }

        private void progressBarX1_Click(object sender, EventArgs e)
        {

        }
        private void LoginValidata()
        {
           
            Thread.Sleep(5000);
            if (DBHELP.checkUser(username, password))
            {
              
                this.BeginInvoke(delclose);
            }
            else
            {
                MessageBox.Show("用户名密码错误,请重新输入");
            }
            this.BeginInvoke(delsetpicvisible);
            myrhre.Abort();
             
        }
        private void Setpicvisible()
        {
            this.pictureBox1.Visible = false;
        }
        private void CloseForm()
        {
            AppRun.frmNext = new FrmMain();
            this.Close();
        }
        private void buttonX1_Click(object sender, EventArgs e)
        {
            username = textBoxDropDown1.Text;
            password = textBoxX1.Text;
            delsetpicvisible = new delLogin(Setpicvisible);
            delclose = new delLogin(CloseForm);
            myrhre = new Thread(new ThreadStart(LoginValidata));
            myrhre.ApartmentState = ApartmentState.STA;
            myrhre.Start();
            pictureBox1.Visible = true;
        }
    }

}