c#使用反射的动态实例化

我正在导出一个报告，我注意到我正在为每个报告复制大量代码。我想把它放在一个单独类的方法中，但经过一些研究，我不确定如何做实例化部分。我的代码如下：

    ActiveReport rpt = new Reports.rptContractListing_Merchant();
    rpt.Run();
    try
    {
        rpt.Run(false);
    }
    catch (DataDynamics.ActiveReports.ReportException eRunReport)
    {
        // Failure running report, just report the error to the user:
        Response.Clear();
        Response.Write("<h1>Error running report:</h1>");
        Response.Write(eRunReport.ToString());
        return;
    }
    XlsExport xls = new XlsExport();
    xls.MinColumnWidth = (float)0.5;
    xls.Export(rpt.Document, m_stream);
    m_stream.Position = 0;
    Response.ContentType = "application/vnd.ms-excel";
    Response.AddHeader("content-disposition", "inline;    filename=ContractListing_Merchant.xls");
    System.IO.MemoryStream m_stream = new System.IO.MemoryStream();
    Response.BinaryWrite(m_stream.ToArray());
    Response.End();

以下是我对反思不确定的部分：

ActiveReport rpt = new Reports.rptContractListing_Merchant();

另一个例子：

    ActiveReport rpt = new Reports.rptContractDetails();
    try
    {
        rpt.Run(false);
    }
    catch (DataDynamics.ActiveReports.ReportException eRunReport)
    {
        // Failure running report, just report the error to the user:
        Response.Clear();
        Response.Write("<h1>Error running report:</h1>");
        Response.Write(eRunReport.ToString());
        return;
    }
    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition", "inline; filename=ContractDetails.pdf");
    PdfExport pdf = new PdfExport();
    System.IO.MemoryStream memStream = new System.IO.MemoryStream();
    pdf.Export(rpt.Document, memStream);
    Response.BinaryWrite(memStream.ToArray());
    Response.End();