Enable a disabled button in WPF

Question

So, I have a button that 's disabled by default on form load and I'd like to enable it when all conditions evaluate to TRUE.

private void OnFormLoad(object sender, RoutedEventArgs e)
    {
        BtnInvoice.IsEnabled = false;
    }
 private void Btn_Click(object sender, RoutedEventArgs e)
    {
        if (Regex.IsMatch(A.Text, "^[a-zA-Z' ]*$") && Regex.IsMatch(B.Text, "^[0-9.]*$") && Regex.IsMatch(C.Text, "^[0-9.]*$"))
        {
         BtnInvoice.IsEnabled = true;
        }

In the above code, when all conditions evaluate to TRUE, my button remains disabled. I'm pretty sure I put the enabling block in the wrong place may also have a logic error.

Answer 1

In situations that I must determine when a button needs to be enabled or not, I prefer implement a Command on that button. The CanExecute on the command holds the logic whether the button is actually enabled or not.

See http://www.wpf-tutorial.com/commands/using-commands .