var reportForm = new ReportViewerForm(); // instantiate the form
        // load the report definition into the viewer:
        reportForm.reportViewer1.LocalReport.ReportEmbeddedResource = "Namespace.Report.rdlc";

        // loading the data works great with a DataSet:
        var data = _reportingDataSet.Tables[0];
        // create the ReportDataSource with the report data:
        var reportDataSource = new ReportDataSource("rdsReportDataSource", data);

        reportForm.ShowReport(new[] { reportDataSource });

public void ShowReport(IEnumerable<ReportDataSource> dataSources)
    {
        foreach (var dataSource in dataSources) reportViewer1.LocalReport.DataSources.Add(dataSource);
        reportViewer1.RefreshReport();
    }

this.reportViewer1.LocalReport.ReportPath = @"Add absolute path of rdlc file"//e.g. @"C:SomeReport.rdlc" ;
this.reportViewer1.RefreshReport();

this.reportViewer1.LocalReport.DataSources.Add(MyreportDataSource);