private string xFiltri;
public string Filtri
{
   get { return xFiltri; }
   set { xFiltri= value; }
}

private void frmFormReport _Load(object sender, EventArgs e)
{
    DataSet1 mioDataset = new DataSet1(); 

    DataSet1TableAdapters.CustomersTableAdapter mioAdapter = new DataSet1TableAdapters.CustomersTableAdapter();
    mioAdapter.Fill(mioDataset, xFiltri );  
   ....
    mioReport.SetDataSource(mioDataset);
    crystalReportViewer1.ReportSoource = mioreport;
   ....