perform addition of integers in list box

sir;

now this is a final code for additing integers in list box .

private void button1_Click(object sender, System.EventArgs e)
        {
            int  a=0, b = 0,c=0;

            for (a=0; a < listBox1.Items.Count;a++)
            {
                b += Convert.ToInt32(listBox1.Items[a]);
                c = c+b;
                b = 0;
            }
            label1.Text = Convert.ToString(c);


           
        }

You cannot do this

  b += int.TryParse(listBox1.Items.Add(a));

you are attempting to add an int to the listbox and then get a total, not possible.


.value My mistake should be


  b += int.TryParse(lb.Items[i].ToString());

You cannot do this

  b += int.TryParse(listBox1.Items.Add(a));

you are attempting to add an int to the listbox and then get a total, not possible.


.value My mistake should be


  b += int.TryParse(lb.Items[i].ToString());

You cannot do this

  b += int.TryParse(listBox1.Items.Add(a));

you are attempting to add an int to the listbox and then get a total, not possible.


.value My mistake should be


  b += int.TryParse(lb.Items[i].ToString());

sir;

i wrote your code . but your code is given error.

       for (a=0; a < listBox1.Items.Count;a++)
            {
                b += int.TryParse(listBox1.Items.Add(a));

            }

i tell you one thing. " .value " does not exist in listbox library .

that makes no difference to the code I gave you.

if you want to total the integers moved to the second list box 2 then this total += TryInt.Parse(ListBox->Items[i].value);  becomes this total += TryInt.Parse(ListBox2->Items[i].value);

hello sir;
my requirement is :

i added many integers in checkedlist box through this code :
          
   code of add integers in list box :

            this.checkedListBox1.Items.Add("3");
            this.checkedListBox1.Items.Add("85");
            this.checkedListBox1.Items.Add("3500");

after this code i used listbox in my form .after this i selected integers like 3 , 3500 etc randomly and move in second list box. my desire integers will be moved from checkedlistbox  to listbox. so, the desire integers has been come in list box. i want to perform addition between these integers that are exit in my list box.

If your question is about getting the total of all integers in a list box then do this

int total = 0;
for(int i = 0; i < ListBox.Items.Count; i ++)
  {
  total += TryInt.Parse(ListBox->Items[i].value);
  }

you may have to do error checking to make sure that the list box value can be converted to an integer.

I have not tried this but it is basically one correct way of doing it.

Is your Question complete?
please clear it.

What you want to do?
You have 2 value in a list & want to add & show it on that list box?
or you have 2 list box chose integer & want to add.
or you want anything else.

Please clear it first. :)