Limiting text box entry to numbers or numpad only - no special characters

Question

I have a small program which accepts an integer and converts it to DateTime. However, I try to use KeyCode to only allow numbers from both keyboard

Answer 1

Instead of intercepting the KeyDown event, I'd simply just remove any non-digit character from the TextBox every time the TextChanged event is raised:

$ToDateText.add_TextChanged({
    # Check if Text contains any non-Digits
    if($tbox.Text -match '\D'){
        # If so, remove them
        $tbox.Text = $tbox.Text -replace '\D'
        # If Text still has a value, move the cursor to the end of the number
        if($tbox.Text.Length -gt 0){
            $tbox.Focus()
            $tbox.SelectionStart = $tbox.Text.Length
        }
    }
})

Way easier than trying to infer the input value from Key event args