[VB.NET] How to store a variable in a listbox?

Let say i am creating a math calculator.

One
Two

When i highlight One and Two and click Sum. It will add one and two together (must be store in a variable)

Erm, you have to get the item selected (Not sure about the code exactly but this should roughly be correct.)

Add this code into the Calculate button:

Code:

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MessageBox.Show(listBox1.SelectedItem + listBox2.SelectedItem & " is the calculated answer");

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Should work, give it a try.

Is this correct?

If i declare a variable called 'One' and a variable called 'Two'.

Example:

Const One as Integer = 1
Const Two As Integer = 2

One = listBox1.SelectedItem
Two = listBox2.SelectedItem

lblShow.Text = One.ToString + Two.ToString

I guess there is some errors there?

Quote:

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Originally Posted by TakaShi^^

Is this correct?

If i declare a variable called 'One' and a variable called 'Two'.

Example:

Const One as Integer = 1
Const Two As Integer = 2

One = listBox1.SelectedItem
Two = listBox2.SelectedItem

lblShow.Text = One.ToString + Two.ToString

I guess there is some errors there?

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That's right, but replace Const with Dim.

Yea what Daney said works aswell, But if you want them stored into Variables, it looks like this:

Quote:

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Public Class Form1
Dim num1 As Integer
Dim num2 As Integer
Dim answer As Integer


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
num1 = ListBox1.SelectedItem
num2 = ListBox2.SelectedItem

answer = num1 + num2

Label1.Text = answer

MessageBox.Show(ListBox1.SelectedItem + ListBox2.SelectedItem & " is the calculated answer")

End Sub
End Class

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Its pretty self explanatory.
We get the currently selected item from listbox1 and place it into num1
Then do the same for listbox2 but place the item value into num2

Now we declare another variable called answer and store the result of adding num1 + num2 together.

Then finally we either make a new label and place the value of answer
into its Text property or do what Daney did and make a message box with the answer.

We'd have to change some of the syntax inside the message box to:

Quote:

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MessageBox.Show(answer & " is the calculated answer")

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Removing the Listbox1.SelectedItem and Listbox2.SelectItem from the syntax and replacing it with our answer variable.

Thanks for your reply. Hmm,

let say each listbox have 5 items

Example

Public Class Form1
' ListBox1
Dim num1 As Integer
Dim num2 As Integer
Dim num3 as integer
Dim num4 As Integer
Dim num5 As Integer

' ListBox2
Dim num6 As Integer
Dim num7 As Integer
Dim num8 as integer
Dim num9 As Integer
Dim num10 As Integer


Dim answer As Integer


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
num1 = ListBox1.SelectedItem = 1
num2 = ListBox1.SelectedItem = 2
num3= ListBox1.SelectedItem = 3
num4 = ListBox1.SelectedItem = 4
num5 = ListBox1.SelectedItem = 5

num6 = ListBox2.SelectedItem = 1
num7 = ListBox2.SelectedItem = 2
num8= ListBox2.SelectedItem = 3
num9 = ListBox2.SelectedItem = 4
num10 = ListBox2.SelectedItem = 5

Is this correct? What are the best way to shorten all this steps ? Using Array?

Variable can be stored in RAM, variable value can be showed in textbox, listbox, shitbox...

You just need to DIM two vairables, what ever item is selected in listbox1 gets put into the variable.

Can you give more detail to what type of program you are making now?
If its a calculator I'd suggest ditching List Boxes for Text Boxes, so that the use can input any number and add them together.

Quote:

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Originally Posted by xSock

You just need to DIM two vairables, what ever item is selected in listbox1 gets put into the variable.

Can you give more detail to what type of program you are making now?
If its a calculator I'd suggest ditching List Boxes for Text Boxes, so that the use can input any number and add them together.

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Hmm i'm actually making a Unit Converter [Weight Conversion & Length Conversion]. Could that be useful?