Set file name while exporting ASP.Net RDLC Report to PDF

hi

I am following this page Export RDLC Report to PDF without using ReportViewer in ASP.Net with C# and VB.Net

can i add date today and name 

Response.AppendHeader("Content-Disposition", "attachment; filename=RDLC." + extension);

name in textbox txtUsername.Text

so in output = RDL_kankon_04-02-2023

protected void Insert2(object sender, EventArgs e)
{
    if (txtUsername.Text == String.Empty)
    {
        ClientScript.RegisterStartupScript(this.GetType(), "randomtext", " alertmecheck()", true);
    }
    else
    {
 
        ReportViewer1.ProcessingMode = ProcessingMode.Local;
        ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/reportviewer/ReportVback.rdlc");
 
        ReportParameter[] param = new ReportParameter[12];
        param[0] = new ReportParameter("Reportbackname", txtUsername.Text);
        param[1] = new ReportParameter("Reportbackjoptitil", joptitel.Text);
        param[2] = new ReportParameter("Reportbackqsem", markazel3mel.Text);
        param[3] = new ReportParameter("Reportbackeldarajah", eldarajah.Text);
        param[4] = new ReportParameter("Reportbackfileid", filenumber.Text);
        param[5] = new ReportParameter("Reportbackcivilid", civilid.Text);
        param[6] = new ReportParameter("Reportbackdatestart", txtBoxDate8.Text);
        param[7] = new ReportParameter("Reportbackdateend", txtBoxDate10.Text);
        param[8] = new ReportParameter("Reportbackdateorderfromstart", txtBoxDate7.Text);
        param[11] = new ReportParameter("Reportbackdateorderfromback1", txtBoxDate11.Text);
        param[9] = new ReportParameter("Reportbackvacationback", ddlPC.Text);
        param[10] = new ReportParameter("Reportbacknote", textmsg.Text);
        ReportViewer1.LocalReport.SetParameters(param);
        ReportViewer1.LocalReport.DataSources.Clear();
        ReportViewer1.LocalReport.Refresh();
 
        string usernamemove = this.Page.User.Identity.Name;
            string constr = ConfigurationManager.ConnectionStrings["kankonConnectionString"].ConnectionString;
            SqlConnection con;
            SqlCommand cmd;
            using (con = new SqlConnection(constr))
            {
                string query = "insert into Table_vacation (idnamev,jop,eldarajah,el3malv,datesp10,idcivilv,datestart,dateend,vacationdata,totalva,infovacation,namevacation,iPAddress,dataaddtime,edit) " +
                    "VALUES (@idnamev,@jop,@eldarajah,@el3malv,@datesp10,@idcivilv,@datestart,@dateend,@vacationdata,@totalva,@infovacation,@namevacation,@iPAddress,@dataaddtime,@edit)";
                using (cmd = new SqlCommand(query))
                {
                    cmd.Connection = con;
 
                    cmd.Parameters.AddWithValue("@idnamev", txtUsername.Text);
                    cmd.Parameters.AddWithValue("@jop", joptitel.Text);
                    cmd.Parameters.AddWithValue("@eldarajah", eldarajah.Text);
                    cmd.Parameters.AddWithValue("@el3malv", markazel3mel.Text);
                    cmd.Parameters.AddWithValue("@datesp10", filenumber.Text);
                    cmd.Parameters.AddWithValue("@idcivilv", civilid.Text);
                    cmd.Parameters.AddWithValue("@datestart", txtBoxDate8.Text);
                    cmd.Parameters.AddWithValue("@dateend", txtBoxDate10.Text);
                    cmd.Parameters.AddWithValue("@vacationdata", txtBoxDate7.Text);
                    cmd.Parameters.AddWithValue("@totalva", lblLabel2.Text);
                    cmd.Parameters.AddWithValue("@infovacation", ddlPC.Text);
                    cmd.Parameters.AddWithValue("@namevacation", "اجازة دورية");
 
                    cmd.Parameters.AddWithValue("@iPAddress", usernamemove);
                    cmd.Parameters.AddWithValue("@dataaddtime", Convert.ToDateTime(DateTime.Now.ToLongTimeString()));
                    cmd.Parameters.AddWithValue("@edit", "(جديد)");
 
                    cmd.Connection = con;
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }
 
            //insert date vacation into user data start date vacation to end date vacation
            using (con = new SqlConnection(constr))
            {
                string query = "UPDATE Table_infoname SET DateTimePicker1 = @DateTimePicker1,DateTimePicker2 = @DateTimePicker2 WHERE civilid = @Civilid";
                using (cmd = new SqlCommand(query))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@civilid", civilid.Text.ToString());
 
                    cmd.Parameters.AddWithValue("@DateTimePicker1", txtBoxDate8.Text.ToString());
                    cmd.Parameters.AddWithValue("@DateTimePicker2", txtBoxDate10.Text.ToString());
 
                    cmd.Connection = con;
                    con.Open();
                    cmd.ExecuteNonQuery();
                    ClientScript.RegisterStartupScript(this.GetType(), "randomtext", " alertADD1()", true);
                    con.Close();
            }
        }
        Warning[] warnings1;
        string[] streamIds1;
        string contentType1;
        string encoding1;
        string extension1;
 
        //Export the RDLC Report to Byte Array.
        byte[] bytes1 = ReportViewer1.LocalReport.Render(rbFormat.SelectedItem.Value, null, out contentType1, out encoding1, out extension1, out streamIds1, out warnings1);
 
        //Download the RDLC Report in Word, Excel, PDF and Image formats.
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "";
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.ContentType = contentType1;
        Response.AppendHeader("Content-Disposition", "attachment; filename=RDL." + extension1);
        Response.BinaryWrite(bytes1);
        Response.Flush();
        Response.End();
    }
}