Using the "Or" operand on String's?

Question

I am trying to execute the following command:

If ComboMonth.Text <> (("September") || ("April") || ("June") || ("November")) Then

Unfortunately however the error i recieve is "character is not valid" for the || operand.

How do i go about using an "or" equivalent operand on Strings such as these, or better yet, why am i recieving this error, surely this should work?

Thank you for your help in advance.

Answer 1

What is the "||" supposed to mean? Logical "Or" is just that ... Or

You might also consider not basing the logic on the text but retrurn the value based on the selected index.

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Please call me Frank :)

Answer 2

Using OR is only possible for boolean values/expressions. So what you can do instead:

If NOT (New String() {"September", "April", "June", "November"}).Contains(ComboMonth.Text ) Then

'
'

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Hannes

If you have got questions about this, just ask.

In a perfect world,
users would never enter data in the wrong form,
files they choose to open would always exist
and code would never have bugs.

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Answer 3

I think there is no other option to do this. you only use 'OR' keyword.

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Art Of Living Is Art Of Giving

Answer 4

Something like this but using <> instead of =

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        
        If TextBox1.Text = "September" OrElse TextBox1.Text = "October" OrElse TextBox1.Text = "November" Then
            Label1.Text = "Equals" & TextBox1.Text
        Else
            Label1.Text = "Not Equal"
        End If
    End Sub

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You've taught me everything I know but not everything you know.

Answer 5

hi, 

this being a VB forum, this is also a possibility:

select case ComboMoth.Text
    case "September", "April", "June", "November"
        ' some code here
    case else
        ' some other code
end select

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Regards, Nico

Answer 6

Ok,

now you are mixing all together. You check if a string (ComboMonth.Text ) is unequal to a Boolean value ( your SelectedIndex... stuff). And also the SelectedIndex will return an Integer whereas you are comparing to a string.

---

Hannes

If you have got questions about this, just ask.

In a perfect world,
users would never enter data in the wrong form,
files they choose to open would always exist
and code would never have bugs.

C# to VB.NET: http://www.developerfusion.com/tools/convert/csharp-to-vb/

Answer 7

I read that i could substitute || for Or, since Or cannot read string's but only integers, but my source was infactual, as is clear to me now.

I agree with your suggestion, so i tried this: 

If ComboMonth.Text <> ((ComboMonth.SelectedIndex = "8") 0r (ComboMonth.SelectedIndex = "3") or (ComboMonth.SelectedIndex = "5") or (ComboMonth.SelectedIndex = "10")) Then

However the error i recieve, which i cannot quiet understand, is :Error    1    ')' expected.

You misunderstood what I meant. Pseudocode here but something like this:

Dim userSelection As String = ComboBox1.Items(ComboBox1.SelectedIndex).ToString

If userSelection = "January" OrElse userSelection = "February" Then
   ' Do something
End If

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Please call me Frank :)

Answer 8

This link may be of assistance http://msdn.microsoft.com/en-US/library/asfcc119(v=vs.80)

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You've taught me everything I know but not everything you know.

Answer 9

Thank you for everybody who went out of their way to put forward some great solutions for me.

I really appreciate this, enjoy the points!

Kaya