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  #1 (permalink)  
Old July 5th, 2005, 09:18 AM
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Default incrementing value of a variable

I am seeking advice on how I can change the code below to increment the value of a variable I called "sum.

On my form, I have the following:
- a simple combo box where user can select from a list
- a txt box where user can enter in a quantity
- a list box to list out the total of each item selected
- a txt box to display the sum

My problem is the txt box to display the grand total. I am having a hard time keeping track of the grand total. My program only display the total for the latest item selected.

Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        Dim sum As Double = 0
        Dim list As String
        Dim total2, totalsp, totalfat, totalipt, totalmfp, totalrb, total2cb, totalicb, totalgcb, totalmfpg As Double
        list = cbo.Text

        Select Case list
            Case "Type 2 Curr. Guide", "Insulin Curr. Guide", "Gestational Curr. Guide "
                total2 = CDbl(qtytxt.Text) * 90
                ListBox1.Items.Add(total2)

            Case "Success Plan"
                totalsp = CDbl(qtytxt.Text) * 5.5
                ListBox1.Items.Add(totalsp)
            Case "Food & Activity Tablet"
                totalfat = CDbl(qtytxt.Text) * 7.95
                ListBox1.Items.Add(totalfat)
            Case "Insulin Plan Tablet"
                totalipt = CDbl(qtytxt.Text) * 7.95
                ListBox1.Items.Add(totalipt)

            Case "My Food Plan "
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    totalmfp = CDbl(qtytxt.Text) * 1.3
                    ListBox1.Items.Add(totalmfp)
                End If
                If CDbl(qtytxt.Text) >= 100 And CDbl(qtytxt.Text) <= 499 Then
                    totalmfp = CDbl(qtytxt.Text) * 1.15
                    ListBox1.Items.Add(totalmfp)
                End If
                If CDbl(qtytxt.Text) >= 500 Then
                    totalmfp = CDbl(qtytxt.Text) * 1
                    ListBox1.Items.Add(totalmfp)
                End If

            Case "My Food Plan for GDM"
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    totalmfpg = CDbl(qtytxt.Text) * 1.3
                    ListBox1.Items.Add(totalmfpg)
                End If
                If CDbl(qtytxt.Text) >= 100 And CDbl(qtytxt.Text) <= 499 Then
                    totalmfpg = CDbl(qtytxt.Text) * 1.15
                    ListBox1.Items.Add(totalmfpg)
                End If
                If CDbl(qtytxt.Text) >= 500 Then
                    totalmfpg = CDbl(qtytxt.Text) * 1
                    ListBox1.Items.Add(totalmfpg)
                End If

            Case ("Record Book")
                If CDbl(qtytxt.Text) >= 1 And CDbl(qtytxt.Text) <= 9 Then
                    totalrb = CDbl(qtytxt.Text) * 1.5
                    ListBox1.Items.Add(totalrb)
                End If
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    totalrb = CDbl(qtytxt.Text) * 1.35
                    ListBox1.Items.Add(totalrb)
                End If
                If CDbl(qtytxt.Text) >= 100 Then
                    totalrb = CDbl(qtytxt.Text) * 1.2
                    ListBox1.Items.Add(totalrb)
                End If

            Case ("Type 2 Client Book")
                If CDbl(qtytxt.Text) >= 1 And CDbl(qtytxt.Text) <= 9 Then
                    total2cb = CDbl(qtytxt.Text) * 7.95
                    ListBox1.Items.Add(total2cb)
                End If
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    total2cb = CDbl(qtytxt.Text) * 7.15
                    ListBox1.Items.Add(total2cb)
                End If
                If CDbl(qtytxt.Text) >= 100 Then
                    total2cb = CDbl(qtytxt.Text) * 6.35
                    ListBox1.Items.Add(total2cb)
                End If

            Case ("Insulin Client Book")
                If CDbl(qtytxt.Text) >= 1 And CDbl(qtytxt.Text) <= 9 Then
                    totalicb = CDbl(qtytxt.Text) * 7.95
                    ListBox1.Items.Add(totalicb)
                End If
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    totalicb = CDbl(qtytxt.Text) * 7.15
                    ListBox1.Items.Add(totalicb)
                End If
                If CDbl(qtytxt.Text) >= 100 Then
                    totalicb = CDbl(qtytxt.Text) * 6.35
                    ListBox1.Items.Add(totalicb)
                End If

            Case ("Gestational Client Books")
                If CDbl(qtytxt.Text) >= 1 And CDbl(qtytxt.Text) <= 9 Then
                    totalgcb = CDbl(qtytxt.Text) * 7.95
                    ListBox1.Items.Add(totalgcb)
                End If
                If CDbl(qtytxt.Text) >= 10 And CDbl(qtytxt.Text) <= 99 Then
                    totalgcb = CDbl(qtytxt.Text) * 7.15
                    ListBox1.Items.Add(totalgcb)
                End If
                If CDbl(qtytxt.Text) >= 100 Then
                    totalgcb = CDbl(qtytxt.Text) * 6.35
                    ListBox1.Items.Add(totalgcb)
                End If
        End Select
        sum = total2 + totalsp + totalfat + totalipt + totalmfp + totalrb + total2cb + totalicb + totalgcb + totalmfpg
        pricelst1.Text = CStr(sum)
    End Sub
  #2 (permalink)  
Old July 5th, 2005, 09:26 AM
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Default

hi there..

for wich i can see.. you are always sum only 1 item, the one you select in the combo.. you want to sum the listed elements???

you can sum the total from the text box in the last statemnet to get it better...

Code:
sum = total2 + totalsp + totalfat + totalipt + totalmfp + totalrb + total2cb + totalicb + totalgcb + totalmfpg + txtgrandtotal.text
HTH

Gonzalo
  #3 (permalink)  
Old July 5th, 2005, 10:25 AM
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Default

Hi,
Thanks for the info. Yes, i am trying to get the list total. I tried your suggestions but it did not quite work. Is there any other way to sum the list? Thanks.
  #4 (permalink)  
Old July 5th, 2005, 10:33 AM
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Default

ok.. what's the problem now??

just add the textbox that has the sum to the moment to the big sum..

your logic only sum the last item, the other are lost because you are not keeping the big total anywhere!

HTH

Gonzalo
  #5 (permalink)  
Old July 5th, 2005, 12:04 PM
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Default

I appreciate all your help. Please bear with me, this is my 2nd VB.Net program so I am still not sure of my code.

You are right in stating that I am only summing 1 number. I think my problem is that I never get to the "grand total". I used your suggestion but I am erring our because first pass through the program, the txt box containing the sum is empty and VB.Net does not like a "" field.

I just want to add all the value in the listbox together to get a sum. Is there any other way to do this? thanks for your advice.


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