-HELP- Adding up Total from Subtotal.

William Lee

I am new to programming, I have 2 textbox's one is the subtotal and total, when i put in a bunch of numbers in the subtotal, i want it to total up.

thanks

william

15 Replies

Know the answer? Post it — somebody with the same question will find it here.

William Lee12y ago
ok thanks again
Vulpes12y ago
As you're using the ListView's SelectedIndexChanged event it will do.

If you re-select a line that's already been processed, it will be processed again because the method has no way of knowing what's already been processed.

If you're going to transfer the subtotal to the second column of the ListView, then the method could check whether there's already something in that column and, if there is, just return without doing anything.
William Lee12y ago
I did something with the code and got to work but one thing lol when I click on the listview items the total keeps adding up after i did one add of the subtotal.
William Lee12y ago
I dont know whats going on :) now the totals and subtotals are not showing any numbers. here is the screenshots of 2 pics.
Vulpes12y ago
The problem here is that you're resetting the total to zero each time you calculate a new sub-total with these lines:

double totResult = 0;
txtTotal.Text = totResult.ToString("c");

Try replacing all the code from this line downwards:

double subResult = sum1 * sum2;

with this:

double subResult = sum1 * sum2;
double totResult;
double.TryParse(txtTotal.Text.Substring(1), out totResult);
totResult += subResult;
txtSubTotal.Text = subResult.ToString("c");
txtTotal.Text = totResult.ToString("c");
William Lee12y ago
Yea i followed it to the tee, everytime i create an item in the listview it should add to the total from the subtotal. here is the code you given me.
Vulpes12y ago
Are you sure you've written:

total += subTotal;

and not:

total = subTotal;
William Lee12y ago
That works and doesnt work, the total shows up but shows the same as the subtotal. we need to increment it by adding the subtotals to the totals, like 36.00 plus 24.00 = 60.00 in the totals. Again thanks for your time.
Vulpes12y ago
I think it's the dollar signs which are causing the problem.

Try this version:

private void btnTotal_Click(object sender, EventArgs e)
{
double subTotal;
double.TryParse(txtSubTotal.Text.Replace("$", ""), out subTotal);
double total;
double.TryParse(txtTotal.Text.Replace("$", ""), out total);
total += subTotal;
txtTotal.Text = "$" + total.ToString("0.00");
}
William Lee12y ago
I didn't get the total here is the screenshot of my program, and thanks for helping me.
Vulpes12y ago
Ah, I think I've got it now. Try this:

private void btnTotal_Click(object sender, EventArgs e)
{
double subTotal;
double.TryParse(txtSubTotal.Text, out subTotal);
double total;
double.TryParse(txtTotal.Text, out total);
total += subTotal;
txtTotal.Text = total.ToString();
}
William Lee12y ago
example. I have a listview and 2 textboxs when i type the numbers in txtPrice and txtQuantity and multiply them i get the subtotal, when I select the item from the listview i get the total, now when I add another item doing it all over again with price and quantity and get the subtotal i should get an update in the total textbox by adding those 2 items. I should have been more clearer. sorry
Vulpes12y ago
It's working OK on my machine if the numbers are separated by spaces.

For example, if I enter this in the subtotal box:

12 15.3 17 20 25.1

and click the button, the total box (correctly) shows:

89.4

So are you separating the numbers with something else such as a comma?
William Lee12y ago
It didn't work, it didnt total the numbers from subtotal, I want it to add the totals from the subtotal numbers.
Vulpes12y ago
If the numbers are separated by one or more spaces and you want to sum them when you click a button (btnTotal say), then this should work.

Note that if any number entered is invalid (say ab or 1,2), it will be treated as zero:

private void btnTotal_Click(object sender, EventArgs e)
{
string[] items = txtSubTotal.Text.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
double total = 0.0;
double d;
foreach (string item in items)
{
double.TryParse(item, out d);
total += d;
}
txtTotal.Text = total.ToString();
}