c# Reportviewer Parameter

Question

I want to show the textbox values ​​on Form1 that I have placed in Form 2 for Reportviewer. I get an example on the Internet or I can help you get an error as shown in the picture below in the code I wrote in my application. Thanks.

Form1 frm = new Form1();
        private void Form2_Load(object sender, EventArgs e)
        {

            this.reportViewer1.RefreshReport();

        }

        private void PassReport()
        {


            ReportParameter[] allPar = new ReportParameter[3]; // create parameters array
            ReportParameter parSum = new ReportParameter("Sum", "195");
            ReportParameter parDiscount = new ReportParameter("discount", "19");
            ReportParameter parTotal = new ReportParameter("total", "176");

            allPar[0] = parSum; //assign parameters to parameter array
            allPar[1] = parDiscount;
            allPar[2] = parTotal;

            reportViewer1.LocalReport.SetParameters(allPar); // set parameter array


        }

        private void reportViewer1_Load(object sender, EventArgs e)
        {
            PassReport();
        }