Help with combo boxes and cost

[john19]

Im new to VB.net and doing a project for college work.

Basically, I have combo boxes that have different computer components.

Here is part of the code for you to understand:

Code:


With cboCPU
.Items.Add("Intel Core i7-920 Bloomfield 2.66GHz Quad core")
.Items.Add("Intel Core 2 Duo E8400 Wolfdale 3.0GHz Dual Core")
.Items.Add("Intel Core 2 Quad Q8200 2.33GHz Quad Core")
.Items.Add("AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Quad core")
End With



The problem im faced with is how to assign a cost to each of these so that i am able to calculate the total. If the user selects the first item display the cost in sub total1 for example.
I looked on google and found out about multi columns in a combo box but the other problem is I cant just add code I dont understand because I have to explain what each part of the code is doing.

Help would be much appreciated because im faced with brick wall at the moment.

[HanneSThEGreaT]

Well, ordinarily, you'd make use of some sort of array, to store the prices. An array is a group of variables with the same datatype, that share the same name. For example :

Dim PC_Cost(3) As Single 'Creates 4 array elements

PC_Cost(0) = 200.45 'Assigns a value to first item in array
PC_Cost(1) = 400.25 'Assigns a value to second item in array
PC_Cost(2) = 100.15 'Assigns a value to third item in array
PC_Cost(3) = 50.50 'Assigns a value to fourth item in array

Why 4 items, and why 0 to 4 instead of 1 to 4 ¿

4 Items because you have 4 items in your combobox
It starts at zero, beacuse all arays are 0 based, and the first index is always 0

Now, how do I link these to the combobox ¿

You simply double click the combobox, that will open the SelectedIndexChanged event handler, and type code similar to the following :

Select Case ComboBox1.SelectedIndex
Case 0
'Do whatever calculations here
'This Item ( Intel Core i7-920 Bloomfield 2.66GHz Quad core ) is now linked to the first item in the PC_Cost array, which is 200.45
End Select

And so on.

See, it is not so difficult

[john19]

Ah right that makes sense to me. Ill go and experiment with this.
I have only just started to learn vb so when i google something to try and find out roughly how to do something, majority of the time its loads of code I havnt even come across before so i have no idea where to even begin trying to decode it all.