How to display dynamics image in sap crystal report C#

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C#

i have web application asp.net button show sap crystal Report i can see all field from database but field image-path no display inside Report

What I have tried:

private void report()
    {
        if (!string.IsNullOrEmpty(Request.QueryString["pId"]) && int.TryParse(Request.QueryString["pId"], out checkInt))
        {
            a.UserPrint(lbluser.Text, checkInt);
            a.Updateprint(checkInt);

            DataTable all = a.checkstatusMaintenance(checkInt);

            if (all.Rows.Count > 0)
            {
                string path = all.Rows[0]["signature"].ToString();

                CrystalDecisions.CrystalReports.Engine.ReportClass rd = new CrystalDecisions.CrystalReports.Engine.ReportClass();

                rd.FileName = Server.MapPath("~/Reports/RecvUnit.rpt");

                rd.RecordSelectionFormula = "{Unit_Recv.ContractNumber} = " + checkInt;
                
                rd.SetParameterValue("imgurl", Server.MapPath(@"~/CanvasImages/"+ path));
                CrystalReportViewer2.ReportSource = rd;
                CrystalReportViewer2.RefreshReport();
                CrystalReportViewer2.DataBind();
            }

        }