Check String (Digit Number, Hexadecimal Numbers and Letter)

In this post, I would to show you how to check string whether if a Digit Numebr, Hexadecimal Numbers or  Letters. I use 3 difference Textboxes using TextChanged_Event  as  below:

1.   TextboxDigit:     for check the string input whether a Digit Number(1-9) or not.

    Private Sub TextBoxDigit_TextChanged(sender As Object, e As EventArgs) Handles TextBoxDigit.TextChanged

        Try

            If Char.IsDigit(TextBoxDigit.Text.Chars(TextBoxDigit.TextLength - 1)) = True Then

            Else

                MsgBox("Only Digits Number are allowed to input!")

            End If

        Catch ex As Exception

        End Try   

    End Sub

2.   TextboxNumber:  for check the string input whether a Hexadecimal Number(1-9, A-F) o or not.

Private Sub TextBoxNumber_TextChanged(sender As Object, e As EventArgs) Handles TextBoxNumber.TextChanged

        Try

            If Char.IsNumber(TextBoxNumber.Text.Chars(TextBoxNumber.TextLength - 1)) = True Then

            Else

                MsgBox("Only Hexadecimal Numbers are allowed to input!")

            End If

        Catch ex As Exception

        End Try

        

    End Sub

3.     TextboxLetter:     for check the string input whether a Letter(A-Z).

Private Sub TextBoxLetter_TextChanged(sender As Object, e As EventArgs) Handles TextBoxLetter.TextChanged

        Try

            If Char.IsLetter(TextBoxLetter.Text.Chars(TextBoxNumber.TextLength - 1)) = True Then

            Else

                MsgBox("Only Letters are allowed to input!")

            End If

        Catch ex As Exception

        End Try

    End Sub

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