C#

How can I create a program that shows information on DVB-T2 USB and shows it in a noutbook ???

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

<pre lang="c#">namespace DAQ_Simulator
{
    public partial class Form1 : Form
    {

        int counter;
        
        int maxSid = 10; //Number of sensors 7analog and 3 digital
        int maxAI, maxDI;
        // string sensor_values;
        string sTxt;
        
        private DateTime datetime;
        // Create an array of 10 sensor objects
          Sensor[] sObj = new Sensor[10];
        

        public Form1()
        {
            InitializeComponent();
        }
        private void displaySensorData(object sender, EventArgs e)
        {     
        }
        private void groupSampl_Enter(object sender, EventArgs e)
        {

        }
        private void textSampling_TextChanged(object sender, EventArgs e)
        {
            


        }
        private void btnSampling_Click(object sender, EventArgs e)
        {                  
                sampling();     
        }

        private void groupLogg_Enter(object sender, EventArgs e)
        {

        }

        private void txtLogging_TextChanged(object sender, EventArgs e)
        {

        }
        private void labelLoggingText_Click(object sender, EventArgs e)
        {

        }
        private void btnLogging_Click(object sender, EventArgs e)
        {
            
        }
        private void labelSensorValues_Click(object sender, EventArgs e)
        {

        }
        private void textSensorValues_TextChanged(object sender, EventArgs e)
        {
           
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
           
        }
        private void sampling()
        {
           

            for (counter = 0; counter < maxSid; counter++)
            {               
                sObj[counter] = new Sensor(counter);              
            }
            
            for (counter = 0; counter < maxSid; counter++)
            {
                for (counter = 0; counter < 10; counter++)
                {
                    sObj[counter] = new Sensor(counter);
                }
                // Get the object values as a string
                for (counter = 0; counter < maxSid; counter++)
                {
                    sTxt += sObj[counter].GetAnalogValue().ToString("F3");
                    textSensorValues.Text = sTxt;
                }                            
                textSensorValues.Text=sTxt;
            }
           
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DAQ_Simulator
{
    public class Sensor
    {
        double dVal;
        bool bVal;
        int sId;
        Random rSensVal;

        public Sensor(int id)
        {
            sId = id;
            rSensVal = new Random(id);
            dVal = 0.0F;
        }
        
        public double GetAnalogValue()
        {
            dVal += rSensVal.NextDouble();
            return dVal;         
       }
       
        public int GetDigitalValue()
        {
            Random bVal = new Random(2);
            int digital = bVal.Next(2);
            return digital;

        }
        public int GetSensId()
        {
            return sId;
        }

private void searchForOus(string ouPath)
{

    DirectoryEntry ADentry = new DirectoryEntry(ouPath, @"domain\user", "password", AuthenticationTypes.Secure);

    DirectorySearcher Searcher = new DirectorySearcher(ADentry);
    Searcher.Filter = ("(objectClass=organizationalUnit)");
    foreach (DirectoryEntry entry in Searcher.SearchRoot.Children)
    {
        Console.WriteLine(entry.Path);


        if (entry.Path == "LDAP://OU=Core Member Servers,dc=XXX,dc=XXX,dc=XX,dc=XXX")

        {
            if (ShouldAddNode(entry.SchemaClassName))
            {
                treeView1.Nodes.Add(GetChildNode(entry));

            }
        }
    }

private TreeNode GetChildNode(DirectoryEntry entry)
{
    TreeNode node = new TreeNode(entry.Name.Substring(entry.Name.IndexOf('=') + 1));

    foreach (DirectoryEntry childEntry in entry.Children)
    {
        if (ShouldAddNode(childEntry.SchemaClassName))
        {
            node.Nodes.Add(GetChildNode(childEntry));

        }
    }




    return node;
}

private bool ShouldAddNode(string schemaClass)
{
    bool returnValue = false;

    if (schemaClass == "organizationalUnit")
    {
        returnValue = true;
    }

    return returnValue;
}

So first I declare my variables:

const double PACKAGE_COST_double = 99;

int purchased; //this will be the number they input in the text box.

double retail; //holds the package retail price, before discounts. (purchased * PACKAGE_COST_double)

double discountrate; //the rate at which each package will be discounted. This will depend on what the                                   //entry into the text box is.

double saved; //this will be the amount saved. So this will be = retail - (retail * discountrate)

double total; //this will be the variable that goes into the final label. This will = (retail * discountrate)


Then I have my formulas for each of my variables:

purchased = int.Parse(purchasedTextBox.Text);
saved = (purchased * PACKAGE_COST_double) * discountrate;
retail = purchased * PACKAGE_COST_double;
total = retail * discountrate;
Then I have my if/else statement to determine what the discountrate is going to be:
 if (purchased >= 100)
            {
                discountLabel.Text = "50%";
                discountrate = .5;
            }
            else if (purchased >= 50 && purchased <= 99)
            {
                discountLabel.Text = "40%";
                discountrate = .4;
            }
            else if (purchased >= 20 && purchased <= 49)
            {
                discountLabel.Text = "30%";
                discountrate = .3;
            }
            else if (purchased <= 19 && purchased >= 10)
            {
                discountLabel.Text = "20%";
                discountrate = .2;
            }
            else if (purchased >= 0 && purchased <= 10);
            {
                discountrate = 0;
            }
And at this point I am pretty much lost. I am not sure what to do now. I know I need to incorporate a try/catch, I have a red line under discountrate when I use it in the first formula at the top, and I am not sure where to go from here. Any help/critiques/comments would be greatly appreciated!