FreeCodeCamp is really nice. It is project based so at the end of it you end up with a basic portfolio. They also have a group chat on Gitter so you can ask questions to others learning through FreeCodeCamp. I have had great success with it and would highly recommend it.

It seems like it is looping through all the values and making the label display all of them. It is probably doing this so fast that you only see the last set value. If you want to see all the values, maybe try lblCount.Text += i.ToString() + " " to display all the values side by side. If you do this, remember to clear out the label before looping.