Read first number from read line in windows form

Question

I have a text file contain :

10 2 3

20 4 5 

25 1 0

6 0 0

 

i have read the whole file into a richtextBox, now i need to read each number from each line and assign them to a function.

eg: length = 10

height = 2;

width = 3.

 

can anyone tell me how to read each element in the line, I am finding only ReadTo end anf ReadLine option. I am not getting how to read each element and initialize to a function.