How to validate number range array in textbox in visual basic?

Question

So basically in a form, you have 3 textboxes and each of them you can input a number, then you have a button that check if each of these textboxes are in a range of numbers specified. It's very much like a lock combo, but I need help checking values, for example; enter image description here

the only thing i can figure out is

Dim intOne As Integer
    Dim intTwo As Integer
    Dim intThree As Integer
    Dim blnInputOk As Boolean = True

    If Integer.TryParse(lblOne.Text, intOne) = False Then
        MessageBox.Show("Value must be an integer")
        blnInputOk = False
    End If

    If Integer.TryParse(lblTwo.Text, intTwo) = False Then
        MessageBox.Show("Value must be an integer")
        blnInputOk = False
    End If

    If Integer.TryParse(lblThree.Text, intThree) = False Then
        MessageBox.Show("Value must be an integer")
        blnInputOk = False
    End If

    If intOne >= 6 And intOne <= 8 Then
        If intTwo >= 2 And intOne <= 9 Then
            If intThree >= 0 And intThree <= 8 Then
                MessageBox.Show("Good code!")
            Else
                MessageBox.Show("Wrong, number must be between range 0 to 8")
            End If
        Else
            MessageBox.Show("Wrong, number must be between range 2 to 9")
        End If
    Else
        MessageBox.Show("Wrong, number must be between range 6 to 8")
    End If

So my question is how can you make this code simpler by adding an array for number range for each textbox? I also know there is a possibility of adding a loop, but i'm not sure how to structure it, can anyone help? thanks

As smead mentioned below, the NumericUpDown() control was made for this as you can specify Minimum() and Maximum() values. The Value() will always be within that range and is guaranteed to be an Integer. — Idle_Mind
– Idle_Mind, Commented Nov 22, 2013 at 0:21
@Idle_Mind Actually, the NumericUpDown uses Decimal type (Min, Max, Value and Increment are all Decimal). The DecimalPlaces property defaults to 0 so it is easy to think it is Integer, but it isnt. — Ňɏssa Pøngjǣrdenlarp
– Ňɏssa Pøngjǣrdenlarp, Commented Nov 22, 2013 at 21:08
@Plutonix, very true. It is effectively an "integer" with the default settings. — Idle_Mind
– Idle_Mind, Commented Nov 22, 2013 at 21:39

ArBR · Accepted Answer · 2013-11-22 03:39:52Z

2

There are many ways, all depends on the number of values you are going to compare, the simplest is by adding a comparison function.

Private Function IsInRange(x As Integer, a As Integer, b As Integer) As Boolean
    Dim r As Boolean
    r = (x >= a And x <= b)
    If r Then
        MessageBox.Show("Good code!")
    Else
        MessageBox.Show(String.Format("Wrong, number {0} must be between range {1} to {2}", x, a, b))
    End If
    Return r
End Function

Then according to the code shown in your question, you can do this:

If IsInRange(intOne, 6, 8) Then
    If IsInRange(intTwo, 2, 9) Then
        IsInRange(intThree, 0, 8)
    End If
End If

answered Nov 22, 2013 at 3:39

ArBR

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1 Comment

PatrickGamboa Over a year ago

woah, the second might help actually! the second code you've shown, is it an array? it would really help if I can store the range values in arrays, is it possible to show your code with the number ranges? (for example the first one, the lower bound number which would be 6 and the higher bound number is 8)

admdrew · Accepted Answer · 2013-11-22 00:01:08Z

1

.NET has input validation functionality on standard input controls. Here's a decent place to start.

answered Nov 22, 2013 at 0:01

admdrew

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1 Comment

smead Over a year ago

Also, for integers you may as well just use NumericUpDown.

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