Don't show Keyboard When Editing TextField

Here's what I'm trying to do... I have a UIDatePicker in a UIView with a toolbar (Cancel/Done buttons). When the user clicks in a UITextField I set the UIView.Hidden to false. I want that to show and not the keyboard.

        txtDateTime.EditingDidBegin += (sender, e) => {
            txtDateTime.EndEditing(true);
            pDateView.Hidden = false;
        };

That code words the first time. When the user clicks the Done button in my toolbar in my UIView, I set my view.Hidden to true. All that works ok. But when I click inside the UITextField again, the keyboard shows and not the view with my picker.

How can not have the keyboard show at at?