Question

I have a dataset which includes some numbers, I want to calculate the sum of the difference in the numbers how do I do this?
For example my dataset looks like this:

Name Score

Luke 100

Adam 90

James 80

Peter 70

Mike 60

How do I calculate the sum of the difference within a “for loop” in vb.net such that it does something like this below:

(100 – 90) + (90 – 80) + (80 – 70) + (70 – 60) = 40

I tried to do this below, but i am not sure of how to add the difference:

Dim i as integer
For i = 0 to ds.tables(0).rows.count
    ds.tables(0).Row(i).Item(1)
    Dim diff = ds.tables(0).Row(i).Item(1) -  ds.tables(0).Row(i+1).Item(1)
    sum = ....
Next

Any help will be appreciated

Answer 1

You can try this,

Dim totalValue As Integer = 0

    For index = 1 To ds.Tables(0).Rows.Count
        totalValue += (CInt(ds.Tables(0).Rows(index - 1).Item(1)) - CInt(ds.Tables(0).Rows(index).Item(1)))
    Next

You can use totalValue as your answer