Crystal report Problem setdatasource pls help me

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C#

CrystalReports

Hi,
i am creating a windows application in ma project i am using crystal report now i met a problem

private void btnShow_Click(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;
            objreportclass = new Report.ReportClass();
            objdatabaseclass = new DataBaseClass();
            objreportclass.FROMDAT = dtpFrom.Text.Trim();
            objreportclass.TODAT = dtpTo.Text.Trim();
            Table = objreportclass.Getreports();
            rptcombinedcollection rr = new rptcombinedcollection();
            rr.SetDatasource(Table);
            crystalReportViewer1.ReportSource = rr;
            this.Cursor = Cursors.Arrow;
        }

i don't get the setdatasource in the line rr.setdatasource what is the problem pls help me

i met the problem that i can't write the line rr.setdatasource(table),means am writing rr. then the setdatasource is not in there pls help me how can i get the setdatasource

Inconsistent accessibility: base class 'Collegeapps.Report.ReportClass' is less accessible than class 'Collegeapps.Report.rptcombinedcollection'

C#.net windows application developer