#### Alex Garbiak

##### New member

- Joined
- May 3, 2011

- Messages
- 3

- Programming Experience
- Beginner

**Background**

I am trying to create a Fibonacci number sequence with the number of terms decided by the user through a ASP drop down box. The Fibonacci sequence is then displayed in a ASP label control further down the page.

The code (below) works fine for up to 45 or so terms. However if a user selects a value above this, say 50, then the following error is thrown:

OverflowException was unhandled by user code. Arithmetic operation resulted in an overflow.

The error is thrown on the line ArrayFibNums(i) = ArrayFibNums(i - 1) + ArrayFibNums(i - 2) in the code shown below:

**Code**

VB.NET:

```
Protected Function FibonaccciNumbers() As Array
Dim NumInSequence As Integer = 0
NumInSequence = CInt(DdlstNumInSequence.SelectedItem.Value)
Dim ArrayFibNums(NumInSequence - 1) As Integer
ArrayFibNums(0) = 1
ArrayFibNums(1) = 1
For i As Integer = 2 To NumInSequence - 1
ArrayFibNums(i) = ArrayFibNums(i - 1) + ArrayFibNums(i - 2)
Next
Return ArrayFibNums
End Function
```

Why is this error thrown? What am I doing wrong and what is the solution to this problem? I'm a beginner "programmer" so I have no idea, just seems a bit random to me.

P.S. I realise this is not a very efficient or elegant way to generate the Fibonacci sequence. I may try to do it through recursion if I can be bothered. I am purely doing this for self-interest purposes (related to the Euler Problem 2 if anyone is interested).