How to pass textbox value to reportviewer textfield using ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.Reporting.WebForms;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ReportParameter[] allPar = new ReportParameter[3]; // create parameters array
        ReportParameter parSum = new ReportParameter("id", "195");
        ReportParameter parDiscount = new ReportParameter("date", "19");
        ReportParameter parTotal = new ReportParameter("name", "176");

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

        ReportViewer1.LocalReport.SetParameters(allPar); // set parameter array
      
    }
}

The Report Viewer Web Control requires a System.Web.UI.ScriptManager on the web form.