备份数据库时怎么显示gif动画呢？

Question

备份数据库的时候想显示一个gif动画，但是那个动画就是不动。using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Threading;namespace SqlTool
{
    public partial class BakData : Form
    {
        public BakData()
        {
            InitializeComponent();
        }
        private Thread ths;
        private void button3_Click(object sender, EventArgs e)
        {
            saveFileDialog1.Filter = "*.bak|*.bak";
            saveFileDialog1.ShowDialog();
            this.textBox1.Text = saveFileDialog1.FileName;
        }        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void BakData_Load(object sender, EventArgs e)
        {
            this.pictureBox1.Visible = false;
            this.label3.Text = ChangeLogin.getDataName;
        }        private void button1_Click(object sender, EventArgs e)
        {
            this.button1.Enabled = false;
            Thread showPic = new Thread(new ThreadStart(threadPict));
            Thread backThread = new Thread(new ThreadStart(threadchange));
            backThread.IsBackground = true;
            showPic.IsBackground = true;
            backThread.Start();
            showPic.Start();
        }        private void showPict()//显示图片
        {
            this.pictureBox1.Visible = true;
        }
        private void backQuery()//执行备份
        {
            Application.DoEvents();
            SqlConnection con = new SqlConnection(LoginSql.conLocalhost);
            try
            {
                con.Open();
                SqlCommand com = new SqlCommand("BACKUP DATABASE [" + label3.Text + "] TO  DISK = N'" + textBox1.Text + "' WITH NOFORMAT, NOINIT,  NAME = N'" + label3.Text + "-完整 数据库 备份', SKIP, NOREWIND, NOUNLOAD,  STATS = 10", con);
                com.ExecuteNonQuery();
                this.Close();
                con.Close();
            }
            catch(Exception ex)
            {
                MessageBox.Show("不能备份数据库" + label3.Text+ex.ToString(), "停止", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                con.Close();
                return;
            }
            MessageBox.Show(label3.Text + "数据备份完成", "成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
        private void threadchange()//通过委托处理
        {
            MethodInvoker isn = new MethodInvoker(backQuery );
            this.BeginInvoke(isn);
        }
        private void threadPict()
        {
            MethodInvoker isn = new MethodInvoker( showPict);
            this.BeginInvoke (isn);
        }
    }
}

Answer 1

有人知道吗？
        private void threadPict() 
        { 
            MethodInvoker isn = new MethodInvoker( showPict); 
            this.BeginInvoke (isn); 
        } 
是这里的问题吗？