Coding : private void txt_PreviewTextInput(object sender, TextCompositionEventArgs e) { e.Handled = !ValidNumeric(e.Text); base.OnPreviewTextInput(e); } bool ValidNumeric(string str) { bool ret = true; int l = str.Length; for (int i = 0; i < l; i++) { char ch = str[i]; ret &= Char.IsDigit(ch); } return ret; } Thanks dedjo Subscribe to the [...]
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