Random Image and Number generator

If btnGenerate clicked userclicked "image"

then

input "image from web" to .picRandom [picturebox]

else

if btnGenerate clicked

userclicked "number"

input "random number" to .txtNumber

I wrote this psuedo code, could anyone how one could pull a random image from the internet, any random image and display it on the pictureBox? I have a feeling this is much more complex than im thinking but is there a way to connect the code into google images?