Below are all methods for checking characters in strings with sample code.
| Method | Description |
| IsDigit | Returns True if the character is a number from 0 - 9 |
| IsLetter | Returns True if the character is a Letter from A - Z |
| IsNumber | Returns True if the character is a hexadecimal number from 0 - F |
| IsLetterOrDigit | Returns True if character is a letter or a number |
| IsPunctuation | Returns True if character is a punctuation mark. |
| IsSymbol | Returns True if character is a symbol |
| IsLower | Returns True if character is a lower case letter |
| IsUpper | Returns True if character is an upper case letterd |
IsDigit
If Char.IsDigit(TextBoxDigit.Text.Chars(TextBoxDigit.TextLength - 1)) = True Then
Else
MsgBox("Only Digits Number are allowed to input!")
End If
IsLetter
If Char.IsLetter(TextBoxLetter.Text.Chars(TextBoxLetter.TextLength - 1)) = True Then
Else
MsgBox("Only Letters are allowed to input!")
End If
IsNumber
If Char.IsNumber(TextBoxNumber.Text.Chars(TextBoxNumber.TextLength - 1)) = True Then
Else
MsgBox("Only Hexi Numbers are allowed to input!")
End If
IsLetterOrDigit
If Char.IsLetterOrDigit(TextBoxLetterOrDegit.Text.Chars(TextBoxLetterOrDegit.TextLength - 1)) = True Then
Else
MsgBox("Only Letters or Digits are allowed to input!")
End If
IsPunctuation
If Char.IsPunctuation(TextBoxPuntuation.Text.Chars(TextBoxPuntuation.TextLength - 1)) = True Then
Else
MsgBox("Only Puntuation are allowed to input!")
End If
IsSymbol
If Char.IsSymbol(TextBoxSymbol.Text.Chars(TextBoxSymbol.TextLength - 1)) = True Then
Else
MsgBox("Only Symbols are allowed to input!")
End If
IsLower
If Char.IsLower(TextBoxLower.Text.Chars(TextBoxLower.TextLength - 1)) = True Then
Else
MsgBox("Only Lower Case are allowed to input!")
End If
IsUpper
If Char.IsUpper(TextBoxUpper.Text.Chars(TextBoxUpper.TextLength - 1)) = True Then
Else
MsgBox("Only Upper Case are allowed to input!")
End If
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