Cancel Key press event

Question

How can I return the key?, mean if I want to allow only integer values in the textbox, how can I don\'t allow user to not enter non-integers, regarding, KeyPress

Answer 1

You can inherit from TextBox and then:

Protected Overrides Sub OnTextInput(ByVal e As System.Windows.Input.TextCompositionEventArgs)

        Dim newChar As Char = Convert.ToChar(e.Text)
        If Not [Char].IsDigit(newChar) Then e.Handled = True

End Sub

C# version

protected override void OnTextInput(System.Windows.Input.TextCompositionEventArgs e)
{    
    char newChar = Convert.ToChar(e.Text);        
    if (!Char.IsDigit(newChar)) e.Handled = true; 
}