Member Avatar for LD Company

Hello programmers!

I want small help with code. I want something to happen when text in TextBox1 is A or B or C without writing same code 3 times. I don't know how to write it. I tried with it:

If TextBox1.Text = "A" or "B" or "C" Then
    'Event
End if

Thanks.

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  • Latest Post Latest Post by AleMonteiro

Dani AI

Generated

wanted a concise way to run the same block when TextBox1.Text is one of several values. 's explicit OR works but gets verbose as the list grows, and 's array/regex ideas point in the right directions. Two clean, maintainable approaches follow: one for short lists (readability), one for larger/configurable sets (performance/maintainability).

Select Case keeps intent clear and is ideal for a small set of literal values:

Select Case TextBox1.Text.Trim()
    Case "A", "B", "C"
        ' event code here
End Select

A collection lookup scales better and avoids repeated text comparisons. Using a HashSet with a case-insensitive comparer gives fast O(1) checks and is handy when values are loaded from config or a database:

Dim allowed = New HashSet(Of String)(StringComparer.OrdinalIgnoreCase) From {"A", "B", "C"}
If allowed.Contains(TextBox1.Text.Trim()) Then
    ' event code here
End If

Practical notes and traps observed in similar threads:

  • Trim input and handle empty/null (use String.IsNullOrWhiteSpace) before testing.
  • Decide case sensitivity up front: StringComparer.OrdinalIgnoreCase or normalize with ToUpperInvariant()/ToLowerInvariant() to avoid mismatches.
  • Regex (as suggested) is good for patterns, but is overkill for literal lists and can be harder to read/maintain.
  • For tiny, one-off checks the explicit OR is acceptable; for anything reused or configurable prefer Select Case or a collection.

These options keep the event code in one place and make future changes (adding/removing allowed values) straightforward.

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Member Avatar for Begginnerdev

Try

If TextBox1.Text = "A" Or TextBox1.Text = "B" Or TextBox1.Text = "C" Then
    'Do Work
End If
Member Avatar for AleMonteiro

There's no magic way to do it, but there's others ways like storing the values A,B,C in an array and loop for a match or using RegEx.

I'd use RegEx for a short code, something like this:

IF ( RegEx.Match(TextBox1.Text, "^[ABC]$").Success ) Then

End If

To use RegEx you need to import System.Text.RegularExpressions.

Edited by AleMonteiro
commented: Nice +2
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