[2008] keychar

I am trying to do an keypress event that only allows numbers, backspace, and enter. I have the part that only allows numbers

Code:

---

If Not (IsNumeric(e.KeyChar)) Then
            e.Handled = True
        End If

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I need to know how to know what keychar the backspace and enter are. Can someone give me a reference?

How about pressing them and trapping the value of e.KeyChar?

Use the KeyDown event. That would give you more flexibility.

vb.net Code:

Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
    Select Case e.KeyCode
        Case Keys.D0 To Keys.D9, Keys.Enter, Keys.Back
            e.Handled = True
    End Select
End Sub

Or simply look them up in ASCII table (widely available on the Internet) ;)
Anyway, the ascii value for BS = 8, and enter = 13. So you need to "And" your conditions, something like this

Code:

---

        Dim ch As Char = e.KeyChar
        If Not IsNumeric(ch) AndAlso ch <> ChrW(8) AndAlso ch <> ChrW(13) Then
            e.Handled = True
        End If

---

e.KeyChar will return ASCII value of that key so you can implement this for numeric value.

Hi,

You can try this foe the enter Key:

vb Code:

' The keypressed method uses the KeyChar property to check 
        ' whether the ENTER key is pressed. 
 
        ' If the ENTER key is pressed, the Handled property is set to true, 
        ' to indicate the event is handled.
 
        If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
            e.Handled = True
        End If

For the Backspace use:

vb Code:

If e.KeyChar = Microsoft.VisualBasic.Chr(Keys.Back) Then
            MsgBox("You pressed the Backkey")
        End If

Wkr,

sparrow1

Anothe quick questions what does this "<>" do I have seen it a few times but dont get it

edit: anothe question is how do I make it do an event when a key is pressed like this

Code:

---

If e.KeyChar <> ChrW(13) Then
            btnEquals_Click()
        End If

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This is new question create new post for it

Quote:

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Originally Posted by ngreenwood6

Anothe quick questions what does this "<>" do I have seen it a few times but dont get it

edit: anothe question is how do I make it do an event when a key is pressed like this

Code:

---

If e.KeyChar <> ChrW(13) Then
            btnEquals_Click()
        End If

---

---

'<>' is the equal not (the != in C#)

btnEquals.PerformClick() is the method you want.

Thanks that worked great.