How to show a progress bar while reading a xml file?

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C#

.NET

WPF

.NET4

CrystalReports

Hi
Im using Crytal report WPF Application to generate a report with xml file and this is the code i use

protected override void OnContentRendered(EventArgs e)
{

    DataSet dset = new DataSet1();
    DataSet reportData = new DataSet();
    reportData.ReadXml("http://192.168.1.10/test/data.xml");
    dset.Tables[0].Merge(reportData.Tables[0]);
    ReportDocument report = null;
    report = new CrystalReport1();
    report.SetDataSource(dset.Tables[0]);
    reportViewer.ViewerCore.ReportSource = report;

}

so someone can provide me a idea or example how to show a progress bar window while xml file read?

reportData.ReadXml("http://192.168.1.10/test/data.xml");

Regards