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Using Escape Keypress to Close a Form

Posted on 2004-10-17
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Last Modified: 2008-01-09
Hi all,

I have just started learning VB.NET and have nearly completed a simple VAT Calculator but have run into one slight problem.  I need to be able to allow the user to press the escape key at any time and terminate the program.  I have a close button so I think I should be able to call that procedure when the key is pressed, but I don't know the code and where to put it for the actual keypress.  I am giving 500 points for this cause I need an answer quite quickly.

Here is the code for my form:

Dim vatrate As Decimal
    Dim excvat As Decimal
    Dim incvat As Decimal
    Dim vat As Decimal
    Dim newrate As Decimal

    Private Sub Form1_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Activated
        txtvatrate.Text = "17.50"
        txtexcvat.Focus()
    End Sub

    Private Sub txtexcvat_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtexcvat.KeyPress
        If e.KeyChar = ControlChars.Cr Then ' if enter key pressed
            e.Handled = True ' remove beep
            btncalcvat_Click(Nothing, Nothing) ' run btncalcvat_click code
        End If
    End Sub

    Private Sub txtincvat_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtincvat.KeyPress
        If e.KeyChar = ControlChars.Cr Then ' if enter key pressed
            e.Handled = True ' remove beep
            btncalcb4vat_Click(Nothing, Nothing) ' run btncalcb4vat_click code
        End If
    End Sub

    Private Sub btncalcvat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btncalcvat.Click
        If txtexcvat.Text = "" Then
            MsgBox("No Input", MsgBoxStyle.Information, "VAT Calculator Error")
            txtexcvat.Focus()
        Else
            If Not IsNumeric(txtexcvat.Text) Then
                MsgBox("Invalid Input", MsgBoxStyle.Information, "VAT Calculator Error")
                txtexcvat.Text = ""
                txtexcvat.Focus()
            Else
                excvat = Val(txtexcvat.Text)
                vatrate = Val(txtvatrate.Text)
                vat = excvat * vatrate / 100
                incvat = excvat + vat
                txtvat.Text = Format(vat, "0.00")
                txtincvat.Text = Format(incvat, "0.00")
                btnclear.Focus()
            End If
        End If
    End Sub

    Private Sub btnclear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnclear.Click
        txtexcvat.Text = ""
        txtvat.Text = ""
        txtincvat.Text = ""
        txtexcvat.Focus()
    End Sub

    Private Sub btncalcb4vat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btncalcb4vat.Click
        If txtincvat.Text = "" Then
            MsgBox("No Input", MsgBoxStyle.Information, "VAT Calculator Error")
            txtincvat.Focus()
        Else
            If Not IsNumeric(txtincvat.Text) Then
                MsgBox("Invalid Input", MsgBoxStyle.Information, "VAT Calculator Error")
                txtincvat.Text = ""
                txtincvat.Focus()
            Else
                incvat = Val(txtincvat.Text)
                vatrate = Val(txtvatrate.Text)
                vat = incvat / (vatrate + 100) * vatrate
                excvat = incvat - vat
                txtvat.Text = Format(vat, "0.00")
                txtexcvat.Text = Format(excvat, "0.00")
                btnclear.Focus()
            End If
        End If
    End Sub

    Private Sub btnsetrate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsetrate.Click
        If txtvatrate.Text = "" Then
            MsgBox("No Input", MsgBoxStyle.Information, "VAT Calculator Error")
            txtvatrate.Focus()
        Else
            If Not IsNumeric(txtvatrate.Text) Then
                MsgBox("Invalid Input", MsgBoxStyle.Information, "VAT Calculator Error")
                txtvatrate.Focus()
            Else
                vatrate = txtvatrate.Text
                txtvatrate.Text = Format(vatrate, "0.00")
                txtexcvat.Text = ""
                txtvat.Text = ""
                txtincvat.Text = ""
                txtexcvat.Focus()
            End If
        End If
    End Sub

    Private Sub btnclose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnclose.Click
        Me.Hide()
    End Sub

End Class



Thanks in advance,

John
0
Comment
Question by:john-formby
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5 Comments
 
LVL 7

Accepted Solution

by:
davidrichardson earned 2000 total points
ID: 12334301
   Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As Boolean

        If msg.WParam.ToInt32() = CInt(Keys.Escape) Then

            Form.Close()

            Return True

        End If

        Return MyBase.ProcessCmdKey(msg, keyData)

    End Function 'ProcessCmdKey
0
 
LVL 14

Author Comment

by:john-formby
ID: 12334320
Thats brilliant, thanks.

John
0
 
LVL 7

Expert Comment

by:davidrichardson
ID: 12334324
try again

   Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As Boolean

        If msg.WParam.ToInt32() = CInt(Keys.Escape) Then

            me.Close()

            Return True

        End If

        Return MyBase.ProcessCmdKey(msg, keyData)

    End Function 'ProcessCmdKey
0
 
LVL 14

Author Comment

by:john-formby
ID: 12334332
I already changed that ;-)

Thanks,

John
0
 
LVL 7

Expert Comment

by:davidrichardson
ID: 12334338
No Problem Glad i could help
0

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