Loading Variables On Startup (without Clicking)

I have made a program that loads files from the network and changes them. It all works great and I must say that I did not expect that I could learn some basics so fast. Any way, When I create a new project with a new form, I can create a button, and if I click on it, I can type the things I want it to do. However, I want the program to load a file on startup of the program (load some variables from files). I tried copy/pasting some pieces of sourcefile that work above the part where it start the actions of clicking a button, but that does not work. If I manage to remove all the compile errors and start the program, it still loads nothing untill I click a button. So my question is, how can I make the program do anything without clicking a button. Example, read a txt from a harddrive called test.txt and save that as a variable "computername" in the program.