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How do I update my label from selection of items in my listBox1 and listBox2?

So I have 2 list boxes within my form. Listbox1 contains different types of items that have a price and Listbox2 contains how much of that item you want to purchase. How do I update my price label so when I select both options from each list box it updates the label and gives me a price. Here's an example to help you better understand.
I select the $1.50 Chocolate Chip Cookie item in my ListBox1 and in ListBox2 I select the 1 Dozen Cookie item. So I would want my priceLabel to update to $18.00. How would I do this?
As of now I have tried creating some code in the listBox1_SelectedIndexChanged method but I am returned these 3 following values... $0.00...$2.00...$4.00
Here's my code:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
double index = listBox1.SelectedIndex;
double index2 = listBox2.SelectedIndex;
double total = index * index2;
label9.Text = total.ToString("C");
}
private void label5_Click(object sender, EventArgs e)
{
}
private void label9_Click(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
{
const int ESTIMATED_ARRIVAL = 3;
label10.Text = monthCalendar1.SelectionStart.AddDays(ESTIMATED_ARRIVAL).ToShortDateString();
}
private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
{
}
}

In listBox1_SelectedIndexChanged(object sender, EventArgs e) you use listBox1.SelectedIndex; and listBox2.SelectedIndex;, if you refer to ListBox.SelectedIndex Property
ListBox.SelectedIndex Property
Gets or sets the zero-based index of the currently selected item in a
ListBox.
Property Value
Int32
A zero-based index of the currently selected item. A value of negative one (-1) is returned if no item is selected.
it just return index of selected item, so for your purpose you must get value of selected item.
I hope this code be a good guide for you:
Add handler of SelectedIndexChanged event of both list boxes to this method:
private void ListBox_SelectedIndexChanged(object sender, EventArgs e)
{
if (this.listBox1.SelectedIndex > -1 && this.listBox2.SelectedIndex > -1)//You can set default SelectedIndex for list boxes and remove this
{
string s1 = this.listBox1.Items[this.listBox1.SelectedIndex].ToString();
string s2 = this.listBox2.Items[this.listBox2.SelectedIndex].ToString();
//Now we extracting the number from string
//NOTE this is a simple implementation. You must change it as your needs.
//for example
//s1 = $1.50 Chocolate Chip Cookie
//s2 = 1 Dozen Cookie
int index = s1.IndexOf(' ');//get the index of first space after 1.50 (Number) in s1
s1 = s1.Substring(1, index);
index = s2.IndexOf(' ');//get the index of first space after 1 (Number) in s2
s2 = s2.Substring(0, index);
if (double.TryParse(s1, out double p1) && double.TryParse(s2, out double p2))
{
const int DOZEN = 12;
double result = p1 * (p2 * DOZEN);
//or
//remove const int DOZEN = 12; and simply
//double result = p1 * (p2 * 12);
this.label9.Text = result.ToString("C");
}
else
{
MessageBox.Show("Can not parse double values.");
}
}
}

C# Adding items with unique numbers in ComboBox with Button Click

I am trying to create comboBox items with unique number sequencer.
With each click on button comboBox items should be added like this;
Item 1
Item 2
Item 3
...
If I modify The name of Item 1; Next click has to name new item as Item 1.
I am unable to create this basic sequencer and require your help.
private void addNew_Click(object sender, EventArgs e)
{
//textBox1.Enabled = true;
//textBox1.Focus();
comboBox1.Items.Add("item", i);
}

define counter on the scope of your form, under form constructor, for example. Like this:
int counter = 1;
public Form1()
{
InitializeComponent();
}
in your method for adding items add item with counter value and then increment counter.
private void addNew_Click(object sender, EventArgs e)
{
//textBox1.Enabled = true;
//textBox1.Focus();
comboBox1.Items.Add("item " + counter.ToString());
counter++;
}

c# loop through list view items and display each in a text box a row at a time with a click of a button

I need to displaying items of the 4th column in a textbox row by row after clicking 'next' button. When the user clicks next, the next row should be displayed until the last row.
Below is the code I have so far, that only displays the last row when button 'next' is clicked. I cannot seem to get the loop right.
public partial class RecordingView : Form
{
public RecordingView()
{
InitializeComponent();
}
public void UpdateListView(ListView listView1)
{
foreach (ListViewItem item in listView1.Items)
{
this.listView1.Items.Add((ListViewItem)item.Clone());
}
}
private void RecordingView_Load(object sender, EventArgs e)
{
//Add column header
listView1.Columns.Add("#", 60);
listView1.Columns.Add("Start time", 100);
listView1.Columns.Add("End time", 100);
listView1.Columns.Add("Duration", 100);
listView1.Columns.Add("Text", 350);
}
private void btnNext_Click(object sender, EventArgs e)
{
for (int i = 0; i < listView1.Items.Count; i++)
{
string line = listView1.Items[i].SubItems[4].Text; //picks list item
rtbCurrentLine.Text = line;
}
}
}
Below is my user interface
user interface
kindly help me figure out where I have gone wrong.

I suggest this, declare a global variable that will get your index of next or previous click:
int intIndex = -1;
Then on your btnNext click event handler, increment it per click:
private void btnNext_Click(object sender, EventArgs e)
{
if (intIndex <= listView1.Items.Count)
{
intIndex++;
string line = listView1.Items[intIndex].SubItems[4].Text;
rtbCurrentLine.Text = line;
}
}

C# How do I link a number box to a scrollbar

I am new to C#. I need to link two number boxes to a single Vscrollbar. The scrollbar button is in the middle and set to zero, as the scroll button moves up or down the numbers change accordingly. I need a minus sign for below zero.
TIA.

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
vScrollBar1.Value = vScrollBar1.Maximum / 2;
ChangeTextBoxValues(vScrollBar1.Maximum / 2, vScrollBar1.Value);
}
private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
int avg = vScrollBar1.Maximum / 2;
ChangeTextBoxValues(avg, e.NewValue);
}
void ChangeTextBoxValues(int AvgValue, int NewValue)
{
textBox1.Text = (AvgValue - NewValue).ToString();
textBox2.Text = (NewValue - AvgValue).ToString();
}
}

Once you have the value you can do some maths with it to populate your textboxes.
private void vScrollBar1_ValueChanged(object sender, EventArgs e)
{
string value = vScrollBar1.Value.ToString();
}

Multiplying two boxes while typing the 2nd operand

Guys im currently making a simple Ordering form, i'm almost done i just need to validate some things, i want to make my Price and Qty multiply after i enter/change the value on Qty without pressing any buttons
for example Price = 10 Qty = Total = 10
if i put a 2 the Total should automatically change to 20 without pressing any buttons
private void btnAddOrder_Click(object sender, EventArgs e)
{
//Get the txtbox then add to dgv
int qty = int.Parse(txtPrice.Text);
int price = int.Parse(txtQty.Text);
txtTotal.Text = (qty * price).ToString();
dgvOrder.Rows.Add(txtItemCode.Text, txtDescription.Text, txtPrice.Text, txtQty.Text,txtTotal.Text);
}
right now that's my code for those 3 txtbox

You can implement TextBox.TextChanged Event for Quantity textbox.
In your Constructor:
MyTextBox.TextChanged += new TextChangedEventHandler( TextChanged );
And Then this Method:
private void TextChanged(object Sender, TextChangedEventArgs e)
{
//Do your stuff here
}