Problems with Key press in Visual Basic 2010

[ohwhatacuteanaconda]

I need assistance with using Keypress to only allow a certain range of numbers (1-26) to be typed into the textbox. When ever I do it, it only allows me to press the numbers "1 and 2".

I'm very new to VB so the help is much obliged. I know Im doing something very stupid! :P

Public Class Form1

Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click


    Dim intMath As Integer
    Dim intReadingWriting As Integer
    Dim intScienceHistoy As Integer
    Dim intSum As Integer
    Dim intAverage As Integer


    intMath = Val(txtMath.Text)
    intReadingWriting = Val(txtReadingWriting.Text)
    intScienceHistoy = Val(txtScienceHistory.Text)

    intSum = intMath + intReadingWriting + intScienceHistoy

    intAverage = intSum / 3

    lblAnswer.Text = intAverage

End Sub


Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
    Close()
End Sub

Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
    lblAnswer.Text = String.Empty
    txtMath.Text = String.Empty
    txtReadingWriting.Text = String.Empty
    txtScienceHistory.Text = String.Empty

    txtMath.Focus()
End Sub

Private Sub txtMath_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtMath.KeyPress
    If (e.KeyChar >= "1" And e.KeyChar <= "26") Or e.KeyChar = ControlChars.Back Then
    Else


        e.Handled = True
    End If
End Sub

Private Sub txtReadingWriting_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtReadingWriting.KeyPress
    If (e.KeyChar >= "1" And e.KeyChar <= "26") Or e.KeyChar = ControlChars.Back Then
    Else

        e.Handled = True
    End If
End Sub

Private Sub txtScienceHistory_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtScienceHistory.KeyPress
    If (e.KeyChar >= "1" And e.KeyChar <= "26") Or e.KeyChar = ControlChars.Back Then
    Else
        e.Handled = True
    End If
End Sub

End Class

[roemerito]

Have you tried this

If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then
            'cancel keys
            e.Handled = True

End If

[ohwhatacuteanaconda]

Thank you for your reply, roemerito!

Is there away to be able to just enter the numbers 1-26....thats the main problem I am struggling with.

Thank you!

[roemerito]

Ok so what im trying to understand is that you one to enter the numbers:

1 to 26 or number 1 -minus number26(1-26)

[roemerito]

Ok forget it i just got it, 1 to 26, no other numbers apart from those!!

ok let me check brb in a few minutes witht he anwser

[roemerito]

Here it is anaconda

the "CommentsTextBox" is where im doing the keyPress event, you will need to change that to where your doing that!

If CommentsTextBox.Text <> "" Then

            Select Case (CommentsTextBox.Text)

                Case "1"
                    If (e.KeyChar < "0" OrElse e.KeyChar > "6") AndAlso e.KeyChar <> ControlChars.Back Then
                        'cancel keys
                        e.Handled = True
                    End If
                Case "2"
                    If (e.KeyChar < "0" OrElse e.KeyChar > "6") AndAlso e.KeyChar <> ControlChars.Back Then
                        'cancel keys
                        e.Handled = True
                    End If
                Case Else
                    If (e.KeyChar < "1" OrElse e.KeyChar > "2") AndAlso e.KeyChar <> ControlChars.Back Then

                        'cancel keys
                        e.Handled = True

                    Else

                    End If
            End Select


        End If

Enjoy!

[roemerito]

Also limit the textboxes for those of MaximumLenght = 2, that will make it easier!

[ohwhatacuteanaconda]

Thanks, roemerito!
I figured it out with your help here is my keypress for my math text box :)

Private Sub txtMath_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtMath.KeyPress
    If txtMath.Text <> "" Then

    End If

    Select Case (txtMath.Text)
        Case "1"
            If (e.KeyChar < "0" Or e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then
                e.Handled = True
            End If
        Case "2"
            If (e.KeyChar < "0" OrElse e.KeyChar > "6") AndAlso e.KeyChar <> ControlChars.Back Then
                e.Handled = True
            End If

        Case Else
            If (e.KeyChar < "1" And e.KeyChar > "2") AndAlso e.KeyChar <> ControlChars.Back Then
                e.Handled = True
            Else
            End If
    End Select
End Sub



    End If