Adding Listbox in textbox using button

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1.00/5 (1 vote)

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.NET2.0

Hi
I have a listbox and textbox
I need to add the sum of all values in a listbox and post the total in a textbox including textbox value.

Technology - C#.net using windows form

Posted 3-May-11 23:03pm

yuvi neon

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OriginalGriff 4-May-11 5:06am

And what have you tried so far?

3 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-05T10:42:00

Here is how to do it:

C#

static int Sum(ListBox listBox) {
    int result = 0;
    for (int index = 0; index < listBox.Items.Count; ++index) {
        int value;
        if (!int.TryParse(listBox.Items[index], out value)) continue;
        result += value;
    }
    return result;
}

//...

int sum = 0;

//what does it mean "including text box value"?
//perhapse, this (optional):
int textBoxValue = 0;
int.TryParse(MyTextBox.Text, out textBoxValue);
sum += textBoxValue;

sum += Sum(MyListBox);

MyTextBox.Text = sum.ToString());

If the numeric type if not int, changes the code accordingly (use double or whatever in Sum).

—SA

Tarun.K.S · Answer 2 · 2011-05-03T23:17:00

Solution 2

Do it like this :

C#

double total=0;
foreach (object item in listBox1.Items)
{
    total += (double)item;
}
txtTotal.Text = total.ToString();

or if you have the values as string, then use double.Parse(item) instead of (double)item.

Posted 3-May-11 23:17pm

Tarun.K.S

Updated 3-May-11 23:20pm

v2

Comments

Kim Togo 4-May-11 5:24am

Good answer, 5

Tarun.K.S 4-May-11 5:50am

Thanks! :)

Tarun.K.S 4-May-11 6:00am

great!

Sergey Alexandrovich Kryukov 5-May-11 16:53pm

Tarun, you need to be sure that each element is double. My 4, therefore.
Please see my answer for safer code.

Tarun.K.S 6-May-11 2:04am

Actually I did mention below my code that, if its a string, you can use Double.Parse. Anyway thanks for the 4.

Sergey Alexandrovich Kryukov 5-May-11 16:58pm

I also added option for "including text box value" as I understand it.
--SA

nit_singh · Answer 3 · 2011-05-03T23:22:00

Solution 3

Another way is u can use Generics and do this in a single line

Like

int total = ListBox1.Items.Cast<listitem>().Select<listitem,>(s => Convert.ToInt32(s.Text)).Aggregate((a, b) => a + b);
</listitem>

but as per KIM TOGO, the short and sweet

ListBox1.Items.Cast<listitem>().Sum(item => int.Parse(item.Text));</listitem>

Posted 3-May-11 23:22pm

nit_singh

Updated 4-May-11 0:18am

v4

Comments

nit_singh 4-May-11 5:31am

try this..it will work

Kim Togo 4-May-11 5:49am

Nice, love Linq.
What about .Sum(item => int.Parse(item.Text)), more simple ?
My 5 for Linq.

nit_singh 4-May-11 6:13am

Yes yours solution is simple and sweet...Thanks

Adding Listbox in textbox using button

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