如何控制　reportViewer 加载动画的显示

        private void btn裁片细码单_Click(object sender, EventArgs e)

        {

//打印前,加载等待动画

            Form1 afrm = new Form1();//我这里用一个Form窗体,做的等待动画

            afrm.Show();

            afrm.Refresh();



//水晶报表打印

            ReportDocument aReportDocument = new ReportDocument();

            aReportDocument.Load(@"E:\CrystalReportsApplication1\裁片细码单.rpt");

            foreach (Table aTable in aReportDocument.Database.Tables)

            {

                aTable.LogOnInfo.ConnectionInfo.ServerName = clsIni.ServerName;//控制面板-数据源

                aTable.LogOnInfo.ConnectionInfo.DatabaseName = clsIni.DatabaseName;//数据库名称

                aTable.LogOnInfo.ConnectionInfo.UserID = clsIni.UserID;//用户名

                aTable.LogOnInfo.ConnectionInfo.Password = clsIni.Password;//密码

                aTable.ApplyLogOnInfo(aTable.LogOnInfo);

            }

            View.SelectionFormula = "{表名.ID}  =  'A001' ";

            View.ReportSource = aReportDocument;

            //View.Zoom(100);



//打印完后,释放等待动画

afrm.Dispose();

        }

public partial class GifForm : Form

    {

        public GifForm()

        {

            InitializeComponent();

        }



        private int t = 0;

        private void button1_Click(object sender, EventArgs e)

        {

            pictureBox1.Visible = false;

         //   pictureBox1.Image = Resources._2;

            pictureBox1.Visible = true;

            Refresh();

         //   Refresh();



            ThreadPool.QueueUserWorkItem(Print,null);

            //Print();



            while (t != 1)

            {

            }



        }



        private void Print(Object o)

        {

            for (int i = 0; i < 15000; i++)

            {

                Console.Write(".");

            }

            Console.WriteLine("..end..:{0}", System.DateTime.Now.ToString("HH.mm.ss.ffff"));

            t = 1;

        }

    }

     PrintJiShuYaoQiu print = new PrintJiShuYaoQiu();

     print.Path = PATH;//自己选择的rdlc报表的报表路径

      print.GetDataTable = dataSet.Tables[dataMember];

     print.GetDataMember = dataMember;

     print.ShowDialog();

     private void PrintJiShuYaoQiu_Load(object sender, EventArgs e)

     {

            this.reportViewerPrint.Reset();

            this.reportViewerPrint.ProcessingMode =   Microsoft.Reporting.WinForms.ProcessingMode.Local;

            this.reportViewerPrint.LocalReport.ReportPath = PATH;

            this.reportViewerPrint.LocalReport.DataSources.Add(new ReportDataSource(dataMember, dataTable));//这里的dataTable，dataMember，PATH都是刚刚那个传过来的

            this.reportViewerPrint.RefreshReport();

        }