You should create a single method to handle the MouseClick event for every control on your form plus the form itself. In that method you would simply increment an integer variable declared at the class level and then display that value in your Label.

To create the event handler you should select the form in the designer and then go to the Properties window and press the Events button. Now double-click the MouseClick event to create the event handler. Now go back to the form and type Ctrl+A to select all your controls. Go back to the Properties window and select the method you previously created from the drop-down list for the MouseClick event. If that event is not listed it means that you have selected at least component that doesn't support that event, so you must manually deselect each one of those first. Alternatively you can deselect all and manually select each one that does support that event.