C# read cube data from text file and draw on screen

Question

Hi,

I am trying to create a simple program that reads data from a file and draws a cube on the screen which is in the txt file.

For some reason it is not displaying the cube properly. It only draws one side of the cube and im not sure my.

If someone could have a look cause i am completely stuck.

I have been coding it in visual studio and have attached the project file.